S T 1 5 2 3 0 W D H A W K 4 SEAGATE
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 3892| | |
Capacity form/unform 4294/ 5160 MB Heads 19| | |
Seek time / track 10.0/ 1.7 ms Sector/track | | |
Controller SCSI2 DI/WI/FAST Precompensation
Cache/Buffer 512 KB ADAPTIVE Landing Zone
Data transfer rate 6.000 MB/S int Bytes/Sector 512
20.000 MB/S ext SYNC
Recording method RLL 1/7 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 55 | -40 70
Power: sleep W Humidity % 8 80 | 5 95
standby W Altitude km -0.305 3.048| -0.305 12.192
idle 9.0 W Shock g 10 | 60
seek W Rotation RPM 5411
read/write W Acoustic dBA
spin-up W ECC Bit 96
MTBF h 800000
Warranty Month 60
Lift/Lock/Park YES Certificates CSA,FCC,IEC435,UL478,VDE
**********************************************************************
L A Y O U T
**********************************************************************
SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995
+---------------------------------------------------------++-+
| || |
+++1 || |
| |J6 || |J1
+++ || |SCSI
| ST15230W/WD || |I/O
| || |
| || |
| |+-1
| |+-+
| || |J1
| || |AUX
| || |
| |+-1
| |XX J1
| 8--------1 |XX Power
| +--------+J2 |XX
+---------------------------------------------------------+ 1
+---------------------------------------------------------+
| |
+++1 |
| |J6 |+-+
+++ || |SCSI
| ST15230WC/DC || |I/O
| || |J1
| || |80Pin
| || |
| || |
| || |
| || |
| || |
| |+-+
| |
| 8--------1 |
| +--------+J2 |
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995
Jumper Setting
==============
REAR VIEW +------ 5V
| +---- GND
(TOP) +5V | | +-- GND
34 J1 1 | 1 | | | + 12V
+-------------------------+-----+ +-------+
----+||||||||||||||||||||| ::::::+-+O O O O+-
+-------------------------++----+ +-------+
68pin I/O Cable |||||| Power
Connection Pin 12A+||||+----------- A0
GND--+||+------------ A1
|+------------- A2
+-------------- A3
+- +5V
---------------------+ Optional connections to
* * * * o o o o o 1| switching circuits in host
* * * o o o o o o| J6 equipment to etablished
---------------------+ drive ID.
| | | | | Power
| | | | +----------- A0
GND---+ | | +------------ A1
| +------------- A2
+-------------- A3
J1/J6 SCSI ID
-------------
+----------+-------------------------------+
| SCSI ID | Jumper Location |
| | PINS |
| | 7-8 | 5-6 | 3-4 | 1-2 |
+----------+-------+-------+-------+-------+
| 0 | OPEN | OPEN | OPEN | OPEN |
+----------+-------+-------+-------+-------+
| 1 | OPEN | OPEN | OPEN | CLOSED|
+----------+-------+-------+-------+-------+
| 2 | OPEN | OPEN | CLOSED| OPEN |
+----------+-------+-------+-------+-------+
| 3 | OPEN | OPEN | CLOSED| CLOSED|
+----------+-------+-------+-------+-------+
| 4 | OPEN | CLOSED| OPEN | OPEN |
+----------+-------+-------+-------+-------+
| 5 | OPEN | CLOSED| OPEN | CLOSED|
+----------+-------+-------+-------+-------+
| 6 | OPEN | CLOSED| CLOSED| OPEN |
+----------+-------+-------+-------+-------+
| 7 | OPEN | CLOSED| CLOSED| CLOSED|
+----------+-------+-------+-------+-------+
| 8 | CLOSED| OPEN | OPEN | OPEN |
+----------+-------+-------+-------+-------+
| 9 | CLOSED| OPEN | OPEN | CLOSED|
+----------+-------+-------+-------+-------+
| 10 | CLOSED| OPEN | CLOSED| OPEN |
+----------+-------+-------+-------+-------+
| 11 | CLOSED| OPEN | CLOSED| CLOSED|
+----------+-------+-------+-------+-------+
| 12 | CLOSED| CLOSED| OPEN | OPEN |
+----------+-------+-------+-------+-------+
| 13 | CLOSED| CLOSED| OPEN | CLOSED|
+----------+-------+-------+-------+-------+
| 14 | CLOSED| CLOSED| CLOSED| OPEN |
+----------+-------+-------+-------+-------+
| 15 | CLOSED| CLOSED| CLOSED| CLOSED|
+----------+-------+-------+-------+-------+
------------+--------+-----PWA------------------
|87654321|J2
+--------+
Enable Terminator-+||||||+-TERMPWR
Delay Motor Start--+||||+--TERMPWR
Enable Motor Start--+||+---SS
Write Protect ----++----Parity Option
J2 Terminator Power-source Table W/WD
-------------------------------------
---1-+ ---1-+ ---1-+
o o | o X | X o |
xxx | o X | X o |
----+ ----+ ----+
Term. Power Term. Power Term. Power
from Bus to SCSI Bus from drive
Pos. A
-------------+-----------------------------------------------------
J2 |
Jumper |
Installation |Jumper Function Description
-------------+-----------------------------------------------------
TE (8) |(Applies only to "W" models)
ON |With the jumper installed, the On-board (non-
|removable) terminator circuits are enabled
|(connected to the I/O lines). Default is jumper
|installed.
+-----------------------------------------------------
OFF |Terminator circuits not connected to I/O lines.
-------------+-----------------------------------------------------
DS ME (7/6) |
OFF OFF |Spindle starts immediately after power up - Default
|setting.
+-----------------------------------------------------
OFF ON |Drive spindle does not start until Start Unit command
|received from host. On Off Spindle Startup is delayed
|by SCSI ID times 12 seconds after power is applied,
|i.e., drive 0 spindle starts immediately when DC
|power connected, drive 1 starts after 12 second
|delay, drive 2 starts after 24 second delay, etc.
+-----------------------------------------------------
ON ON |Drive spindle starts when Start Unit command received
|from host. Delayed start feature is overridden and
|does not apply when ME jumper is installed.
-------------+-----------------------------------------------------
WP (5) |
ON |Entire drive is write protected. Off Drive is not
|write protected. Default is no WP jumper installed.
-------------+-----------------------------------------------------
PE (4) |
ON |Parity checking and parity error reporting by the
|drive is enabled. Default is PE jumper installed.
+-----------------------------------------------------
OFF |Drive checks parity, but does not report result of
|parity checking to host.
-------------+-----------------------------------------------------
SS (3) |
OFF |Reserved jumper position. Default is no jumper
|installed.
-------------+-----------------------------------------------------
TP TP(2/1)|(Not used on "WC/DC" models)
OFF OFF |No terminator power is connected to drive terminators
|or SCSI bus.
+-----------------------------------------------------
ON OFF |Drive supplies its own terminator power only. Jumper on
|this position is factory default.
+-----------------------------------------------------
OFF ON |Drive supplies power to SCSI bus; pins 17, 18, 51 and
|52 none to internal terminators. When drives have
|differential I/O circuits, a jumper on the right TP
|position may be needed to power external terminators
|(see system documentation). The ST15230WD drive has
|differential I/O circuits which have no terminator
|circuits on the drive.
|The "WC/DC" models have no provisions for
|terminators on the drive and no provisions for
|terminator power to be supplied to the 80 pin I/O
|connector on the drive.
+-----------------------------------------------------
ON ON |Drive supplies terminator power to itself (internal
|connection) and to SCSI bus pins 17, 18, 51 and 52.
|This is a legal jumper setting.
+-----------------------------------------------------
TP Position A|(Applies to "W" models only)
ON |This horizontally positioned jumper across the two
|TP positions nearest PCB edge, connects terminator
|power from SCSI bus I/O pin 26 to the drive's
|internal terminators (for single-ended I/O only).
+-----------------------------------------------------
OFF |See above explanations for TP jumpers.
-------------+-----------------------------------------------------
-------------+-----------------------------------------------------
J1-Auxiliary |
Jumper | Jumper Function Description ("W" and "WD" models only)
Installation | Drive ID on SCSI Bus (J1-auxiliary or J6 may be used,
A3,A2,A1,A0 | as the ID circuits are wired in parallel).
| The drive ID is binary coded positionwise i.e. jumper
| in position A 3 is drive ID 8, A 2 is drive ID 4,
| position A 1 is ID 2, position A 0 is ID 1 and no
| jumpers is ID 0. Default is ID = 0. Both J1- auxiliary
| and J6 should not be used at the same time, because at
| some future time when the ID is changed the user could
| fail to configure both J1-auxiliary and J6 the same.
| "WC/DC" Models, do not have J1-auxiliary.
-------------+------------------------------------------------------
-------------+------------------------------------------------------
J6 Jumper |
Installation | Jumper Function Description ("W" and "WD" models only)
A3,A2,A1,A0 | Drive ID on SCSI bus. Either J6 or J1-Auxiliary
| (optional) may be used to select drive ID. Both
| should not be used at the same time, because at some
| future time when the ID is changed the user could fail
| to configure both the same. Default is ID = 0.
-------------+------------------------------------------------------
-------------+------------------------------------------------------
LED | Time shared (see Note [4]) J6 pin 8 used to connect a
| cable for a remote drive activity LED indicator. Pin 8
| (bottom), the cathode connection, connects in the
| drive to GRD through the emitter-collector junction
| of a transistor switch that controls the LED on/off
| condition. Pin 11, the anode connection, connects in
| the drive to the +5 V supply through a pull-up
| resistor. For "WC" and "DC" models LED signal in
| J1 may be used instead.
-------------+------------------------------------------------------
NOTE
The PCB on "WC/DC" models does not have connector J1-Auxiliary. It
has a single 80 pin combined SCSI I/O and DC power connector instead
of the 68 pin SCSI I/O and 4 pin DC power connectors. Includes among
the 80 pins are the SCSI ID, Motor Start and Delayed Motor Start
select functions, and the remote drive activity LED signal. Do not
use J6 for these functions if the host uses the ones included in the
80 pin J1 connector.
NOTE
Jumper header J6 can be used in one of five possible ways:
- Do not use J6 at all, but instead use the same functions conveyed
on lines in the 80 pin I/O J1 connector ("WC/DC" models), or for
"W" and "WD" models, use J1-Auxiliary.
- Use jumpers on J6 only to establish drive ID on the SCSI bus. Do
not use both J6 and J1 or J1-Auxiliary signals to establish the
drive ID. The drive activity LED signal in connector J1 or J1-
Auxiliary may be used to convey that signal to/from the host.
- Install a connector/cable on J6 for remote drive ID switching. Do
not use both J6 and J1 signals to establish the drive ID. The drive
activity LED signal in the 80 pin J1 I/O connector or J1-Auxiliary
can be used in this situation.
- Install a connector/cable on J6 for remote Drive Activity LED.
Use the 80 pin I/O connector J1 for the drive ID signals ("WC/"DC"
models) or J1-Auxiliary ("W" and "WD" models).
- Install a connector/cable on J6 for all (remote ID switching and
remote drive activity LED). Do not use both J6 and J1 or J1-
Auxiliary to establish drive ID.
**********************************************************************
I N S T A L L
**********************************************************************
SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995
Notes On Installation
=====================
Installation
------------
Drive default mode parameters are not normally needed for installa-
tion. Ensure that the SCSI ID of the drive is not the same as the
host adapter. Most host adapters use SCSI ID 7, which is the highest
priority on both 8 and 16 bit data busses.
If multiple devices are on the bus set the drive SCSI ID to one
that is not presently used by other devices on the bus.
If the drive is the only device on the bus, attach it to the end
of the SCSI bus cable. Permanently installed terminators must be
enabled on the drive for ST15230W models using a jumper plug. For
ST15230WD/WC/DC models, terminators must be installed external to
the drive. These external terminators must be provided by the
user, systems integrator or host equipment manufacturer.
If the drive is attached to a bus that contains other devices, and
the new drive is not attached to the end of the bus, the terminator
enable jumper should be removed from the new drive.
Set all appropriate option jumpers for desired operation prior to
power on. If jumpers are changed after power has been applied,
recycle the drive power to make the new settings effective.
Installation instructions are provided by host system documentation
or with any additionally purchased drive installation software.
The manufacturers installed labels must not be removed from the
drive or covered with additional labels, as they contain
information required when servicing the product.
Caching write data
------------------
Write caching is a write operation by the drive that makes use of a
drive buffer storage area where the data to be written to the
medium is stored in one or more segments while the drive performs
the write command.
Write caching is enabled along with read caching. For write caching,
the same buffer space and segmentation is used as set up for read
functions. The buffer segmentation scheme is set up or changed
independently, having nothing to do with whether or not read and
write caching is enabled or disabled. When a write command is issued,
the cache is first checked to see if any logical blocks that are to
be written are already stored in the cache from a previous read or
write command. If there are, the respective cache segments are
cleared. The new data is cached for subsequent Read commands.
If the number of write data logical blocks exceeds the size of the
segment being written into when the end of the segment is reached,
the data is written into the beginning of the same cache segment,
overwriting the data that was written there at the beginning of the
operation. However, the drive does not overwrite data that has not
yet been written to the medium.
Installation
------------
The drive is designed, manufactured, and tested with a "Plug in and
Play" installation philosophy. This phi-losophy minimizes the
requirements for highly trained personnel to integrate the drive
into the OEM's system, whether in a factory or field environment.
The drive has been low level formatted at the factory and should
not be reformatted, unless the sector size or sparing allocation
scheme is changed.
Air cleanliness
---------------
The drive is designed to operate in a typical office environment
with minimal environmental control.
Drive Orientation
-----------------
The balanced rotary arm actuator design of the drive allows it to
be mounted in any orientation. All drive performance
characterization, however, has been done with the drive in
horizontal (discs level) and vertical (drive on its side)
orientations, and these are the two preferred mounting orientations.
Cooling
-------
Cabinet cooling must be designed by the customer so that the ambient
temperature immediately surrounding the drive will not exceed
temperatur. Specific consideration should be given to make sure
adequate air circulation is present around the PCBs to meet the
requirements. Cables should be routed such that they do not block
cooling air flow.
Drive Mounting
--------------
When mounting the drive using the bottom holes care must be taken
to ensure that the drive is not physically distorted due to a stiff
non-flat mounting surface. The allowable mounting surface stiffness
is 80 lb/in (14.0 N/mm). The following equation and paragraph define
the allowable mounting surface stiffness:
k * x = 80 lb (14.0 N)
where 'k' represents the mounting surface stiffness (units of lb/in
or N/mm), and, 'x' represents the out-of plane mounting surface
distortion (units of inches or millimetres). The out-of plane
distortion ('x') is deter-mined by defining a plane with three
of the four mounting points fixed and evaluating the out-of-plane
deflection of the fourth mounting point when a known force is applied
to the fourth point.
Media description
-----------------
The media used on the drive has a diameter of approximately 95 mm
(approximately 3.7 inches). The alumi-num substrate is coated with
a thin film magnetic material, overcoated with a proprietary
protective layer for improved durability and environmental protec-
tion.
Grounding
---------
Signal ground (PCB) and HDA ground are connected together in the
ST15230 drive and cannot be separated by the user. The equipment
in which the drive is mounted is connected directly to the HDA and
PCB with no electrically isolating shock mounts. If it is desired
for the system chassis to not be connected to the HDA/PCB ground,
the systems integrator or user must provide a nonconductive
(electrically isolating) method of mounting the drive in the
host equipment.
DC cable and connector
----------------------
The "W" and "WD" model drives receive DC power through a 4 pin
connector mounted at the rear of the main PCB.
Recommended part numbers of the mating connector are listed below,
but equivalent parts may be used.
Mating connector parts
----------------------
Type of cable Connector Contacts (20-14 AWG)
14 AWG AMP 1-480424-0 AMP 60619-4 (Loose Piece)
AMP 61117-4 (Strip)
For "WC/DC" models, the DC power is routed through the SCSI 80 pin
I/O connector. Current carrying capacity is for one drive only,
plugged directly into the Host 80 pin I/O connector (no cable).
Physical description
--------------------
The "W" and "WD" model drives may be daisy-chained with other
compatible SCSI devices using the same type cable. Both ends of
the cable must be terminated. The model ST15230W and ST15230WC
drives implement single ended drivers and receivers. The ST15230WD
and ST15230DC model drives implement differential drivers and
receivers. All signals are common between all SCSI devices.
The drive may be daisy-chained only with SCSI devices having the
same type drivers and receivers. Devices having single ended
interface circuits cannot be on the same daisy-chain with
devices having differential interface circuit. A maximum of 16
SCSI devices (including the Host) may be daisy-chained together.
The SCSI Devices at both ends of the daisy-chain are to be
terminated. Intermediate SCSI devices shall not be terminated.
Remove the terminator enable jumper TE, not the terminator power
source selector jumper TP.
"WC/DC" model drives plug into PCB or bulkhead connectors in the
Host. They may be connected in a daisy-chain by the host backplane
wiring or PCB circuit runs that have adequate DC current carrying
capacity to support the number of drives plugged into the PCB or
bulkhead connectors. A single 80 pin I/O connector cannot support
the DC current needs of several drives, no daisy-chain cables
should be used. A single drive connected via a cable to a host
80 pin I/O connector is not recommended.
Single ended I/O circuits ("W/WC" models)
-----------------------------------------
The maximum total cable length for use with drives having single
ended I/O driver and receiver circuits shall be 6 metres (19.7 ft.)
when operating at line data transfer rates of 5 Mbytes/sec or less,
and 3 metres (9.85 ft.) when operating at transfer rates greater
than 5 Mbytes/sec (FAST SCSI). A stub length of no more than 0.1
metre (0.33 ft.) is allowed off the mainline interconnection with
any connected equipment. An ideal impedance match with cable
terminators implies a cable characteristic impedance of 132 ohms.
Differential I/O circuits ("WD/DC" models)
------------------------------------------
The maximum total cable length for use with drives having
differential I/O drivers and receiver circuits shall be 25 metres
(82 ft.). A stub length of no more than 0.2 metre (0.66 ft.) is
allowed off the mainline interconnection with any connected
equipment. An ideal impedance match with cable terminators implies
a cable characteristic impedance of 122 ohms).
General cable characteristics
-----------------------------
A characteristic impedance of 100 ohm 10% is recommended for
unshielded flat or twisted pair ribbon cable. However, most
available cables have a somewhat lower characteristic impedance.
To minimize discontinuances and signal reflections, cables of
different impedance's should not be used in the same bus.
Implementations may require trade-offs in shielding
effectiveness, cable length, the number of loads, transfer rates,
and cost to achieve satisfactory system operation. If shielded and
unshielded cables are mixed within the same SCSI bus, the effect of
impedance mismatch must be carefully considered. Proper impedance
matching is especially important in order to maintain adequate
margin at FAST SCSI transfer rates.
Cable for "W" and "WD" model drives
-----------------------------------
Only nonshielded cable connectors are applicable. A 68 conductor flat
cable or 34 twisted pair cable shall be used. A minimum conductor
size of 28 AWG should be used to minimize noise effects.
Suggested nonshielded flat cable part numbers are:
Flat cable - 35M-3365-68
Twisted pair - Spectra Twist in flat 455-248-68
Equivalent parts may be used.
Cables for "WC/DC" drive models
-------------------------------
The 80 pin connector option is intended for use on drives that plug
directly into a PCB or wall/bracket mounted connector in the host
equipment. Cable mounted connectors would not be used in such a
case. Installations with cable mounted connectors are not
recommended.
Mating connector for "WC/DC" models:
------------------------------------
The nonshielded mating connector shall be an 80 pin connector
consisting of two rows of 40 male pins with adjacent pins 50 mils
(1.27 mm) apart. The connector is keyed by virtue of its shape.
Mating connectors for "W" and "WD" drive models
-----------------------------------------------
The nonshielded cable connector shall be a 68 conductor connector
consisting of two rows of 34 female contacts with adjacent contacts
50 mils (1.27 mm) apart.
Recommended Mating Flat Cable Connector Part Numbers are:
-----------+-------------------+-------------------------------------
Closed end |Amp Model 749925-5 | (50 mil conductor centers for 28 or
(For cable | | 30 AWG wire). This connector can
ends) | | only be used on cable ends. Use
| | two, 34 conductor, 50 mil center
| | flat cable with this connector.
-----------+-------------------+-------------------------------------
Open end |Amp limite |
|88-5870-294-5 | W/O Strain Relief, (25 mil conductor
| | centers, 30 AWG wire). Use either on
| | cable ends or in cable middle
| | section for daisy-chain
| | installations.
The disc drive device connector is a nonshielded 68 conductor
connector consisting of two rows of 34 female pins with adjacent
pins 1.27 mm (0.050 inches) apart. The connector is keyed by means
of its shape.
Mating connectors for "WC/DC" models
------------------------------------
The nonshielded connector shall be an 80 conductor connector
consisting of two rows of 40 contacts with adjacent contacts
50 mils (1.27 mm) apart. The connector is keyed by its shape.
Recommended PCB or bulkhead mounted connectors are:
Straight-in connector (most commonly used):
Seagate P/N: 77678703
Amp US P/N: 2-557103-1
Amp Japan P/N: 5-175475-9
Right angle to PCB connector:
Seagate P/N: 77678559
Amp US P/N: 2-557101-1
Amp Japan P/N: 5-175474-9
J2 Jumper plug part number
---------------------------
Option select header connector J2 on the PCB uses an unusual type
of jumper plug, so its part number is given here for reference:
Molex 52747-0211 (Seagate P/N 77670952).
A bag with the two jumper types used on the drive is included with
every standard OEM drive.
Electrical description
----------------------
Model ST15230W uses single ended interface signals. These signals
must be terminated with 110 ohm active termination circuits at each
end of the total cable. The terminators are enabled (or disabled) by
installing (or removing) jumper plug TE. Single Ended circuits use
open collector or three state drivers. The model ST15230WC uses
single ended interface signals, but there are no provisions for
terminators on the drive.
Models ST15230WD and ST15230DC use differential interface signals
and each of these must be termi-nated at each end of the total
cable with 330 ohms to +5 V and 330 ohms to ground with 150 ohms
between each differential pair. All I/O circuits are open
collector, three state drivers. Differential I/O drives are
shipped without terminators. These drives have no provisions
for adding terminators on the PCB. On these drives some method
of external termination must be provided by the user Systems
Integrator or host equipment manufacturer.
Transmitter characteristics
---------------------------
Single ended drives use an ANSI SCSI compatible open collector
single ended driver. This driver is capable of sinking a current
of 48 mA with a low level output voltage of 0.4 volt.
Receiver characteristics
------------------------
Single ended drives use an ANSI SCSI single ended receiver with
hysteresis gate or equivalent as a line receiver.
Differential drivers/receivers
------------------------------
The drive has no provisions for terminator circuits on differential
I/O drives.
Differential signals
--------------------
All differential interface signals consist of two lines denoted
+SIGNAL and -SIGNAL. A signal is true when +SIGNAL is more positive
than -SIGNAL, and a signal is false when -SIGNAL is more positive
than +SIGNAL. All assigned signals shall be terminated at each
end of the cable. Drive user, Systems integrator or Host equipment
manufacturer must provide some external means of termination.
Output characteristics
----------------------
Each signal driven by differential interface drives shall have the
following output characteristics when measured at the disc drive
SCSI connector:
Low-level output voltage = 2.0 V maximum at Low-level output
current = 55 milliamps.
High-level output voltage = 3.0 V minimum at High-level output
current = -55 milliamps
Differential voltage = 1.0 V minimum with commonmode voltage
ranges from -7 V dc to +12 V dc.
The output characteristics shall additionally conform to EIA RS-485-
1983.
Input characteristics
---------------------
Each signal received by differential interface drives shall have the
following input characteristics when measured at the disc drive
SCSI connector:
Input current on either input = +2.0 milliamps maximum (includes
both receivers and passive drivers).
This requirement shall be met with the input voltage varying between
-7 V dc and +12 V dc, with power on or off, and with the hysteresis
equaling 35 mv, minimum.
The input characteristics shall additionally conform to EIA RS-485-
1983.
Terminator requirements
-----------------------
Internal disc drive I/O termination (provided only in single ended
I/O model ST15230W drives) consists of active circuits in an LSI
module that is permanently mounted on the PCB. All single initiator/
single target (nondaisychain) applications require that the
Initiator and disc drive be terminated. Daisy-chain applications
require that only the units at each end of the daisy-chain be
terminated. All other peripherals on the chain must not be
terminated.
Note.
Remove drive terminator enabling jumper TE where terminators are not
required. Removal of terminator power source selection jumper TP
does not disconnect the terminator resistors from the circuit.
It is highly recommended that ANSI SCSI-2 Standard's Alternative 2
termination (active termination) be used for single-ended ST15230W
and ST15230WC applications, especially if the bus will be operated
at transfer rates above 5 Mbytes/sec. The ST15230W provides on-board
active termination that can be disabled by removal of the enable
jumper TE.
Note
Active terminators are highly recommended for use in the daisy-chain
as described above. Active and passive terminators should not be
mixed on the same SCSI bus.
Differential I/O ST15230WD does not have terminators on the PCB.
The user, systems integrator or host equipment manufacturer must
provide a terminator arrangement external to the drive. Models
ST15230WC and ST15230DC do not have terminators on the drive PCB
and there is no provision for terminator power in the 80 pin I/O
connector.
Terminator power
----------------
The "W/WD" model drives may be configured to accept terminator power
from drive connector pins 17, 18, 51 and 52 of the SCSI Bus, to
supply power to the SCSI bus or to provide terminator power for
internal termination circuits from the drive power connector.
The drive can provide power both to its own terminators and to
the SCSI Bus terminators at the other end of the I/O cable if both
"TP" jumpers are on (models ST15230W/WD only).
SCSI devices providing terminator power (TERMPWR) shall have the
following characteristics:
V TERM = 4.50 V to 5.25 V
800 mA min source drive capability
1.0 A maximum
The "WC" and "DC" model drives cannot furnish terminator power,
because no conductors in the 80 pin I/O cable are devoted to
terminator power.
**********************************************************************
F E A T U R E S
**********************************************************************
SEAGATE ST15230W/WD/WC/DC PRODUCT MANUAL 77767479 REV. A 3/1995
Scope
-----
This Manual describes the Seagate Technology, Inc. Hawk 4 Family Disc
Drive. This high capacity, high performance member of the Seagate 3.5
inch rigid disc family is a companion product to the ST12400 drive
family. It has an embedded SCSI controller. Performance information
is given in Section 5. The Hawk 4 Family interface is defined for
functional compatibility to a subset of the Seagate SCSI Interface
Specification 77738479, and the ANSI SCSI-2 and SCSI-3 standards.
The Model Hawk 4 Family drives are classified as "Intelligent"
peripherals. The Hawk 4 Family provides Level 2 conformance (highest
level) with the ANSI SCSI-1 standard. Details of the Hawk 4 Family
drive SCSI implementation are provided in Section 11 of this manual,
(Vol. 1) and in the SCSI Interface Product Manual P/N 77738479 (Vol.
2; Ver. 2).
The Hawk 4 family of drives consists of the ST15230W/WD/WC/DC drives.
From this point on in this Product Manual the reference to Hawk 4
Family is referred to as "the drive" (unless reference to individual
models are necessary). The drive printed circuit board is referred
to as a PCB.
Applicable standards and reference documentation
------------------------------------------------
The drive has been developed as a system peripheral to the highest
standards of design and construction. The drive depends upon its host
equipment to provide adequate power and environment in order to
achieve optimum performance and compliance with applicable industry
and governmental regulations. Special atten-tion must be given in the
areas of safety, power distribution, shielding, audible noise
control, and temperature regulation. In particular, the drive must be
securely mounted in order to guarantee the specified performance
characteristics.
Standards
---------
The Hawk 4 Family (Wide) complies with Seagate standards as noted in
the appropriate sections of this manual and the Seagate SCSI
Interface Specification, P/N 77738479 (Vol. 2, Version 2).
The Hawk 4 Family is a UL Recognized component per UL 1950 and a CSA
Certified component per CAN/ CSA-C22.2 No. 950-M89. It also meets the
requirements of DIN VDE 0805:1993 and EN60950: 1992 (IEC 950).
The drive, as delivered, is designed for system integration and
installation into a suitable enclosure prior to use. As such the
drive is supplied as a subassembly and is not subject to Subpart J
of Part 15 of the FCC Rules and Regulations nor the Radio
Interference Regulations of the Canadian Department of
Communications. However, the unit has been tested using proper
shielding and grounding and found to be compliant with Class A
limits of the FCC Rules and the Regulations of The Canadian
Department of Communications.
The physical design characteristics of the drive serve to minimize
radiation when installed in an enclosure that provides reasonable
shielding. As such, the drive is capable of meeting the Class B
limits of the FCC Rules and Regulations of the Canadian Department
of Communication. However, it is the users responsibility to assure
that the drive meets the appropriate EMI requirements in their
system. Shielded I/O cables may be required if the enclosure does
not provide adequate shielding. If the I/O cables are external to
the enclosure, shielded cables should be used, with the shields
grounded to the enclosure and to the host controller.
CAUTION!
To avoid potential service problems, observe the following precau-
tions: The Manufacturers installed labels must not be removed from
the drive or covered with additional labels, as they contain
information required when servicing the product.
Applicable reference documents
------------------------------
Installation Guide Seagate P/N 77767477
Product Manual - SCSI Interface Seagate P/N 77738479
ANSI Small Computer System Interface (SCSI): Document Number
ANSI3.131-1986 (X3T9/84.40 Rev. 1B) (X3T9.2/82-2 Rev. 17B),
X3T9.2/86-109 Revision 10H (SCSI-2) and X3T9.2-184 Rev. 4 (SCSI-3).
Seagate Package Test Requirements P/N 30190-001 (packages under 100
lbs) Seagate Package Test Requirements P/N 30191-001 (packages over
100 lbs).
In case of conflict between this document and any referenced
document, this document shall take precedence.
General description
-------------------
The drives are a member of a family of low cost, high performance,
highly reliable, random access storage devices designed to meet the
needs of the OEM marketplace.
The drive records and recovers data on 3.7 inch (95 mm) fixed discs.
The drive supports the Small Computer System Interface-2 (SCSI) as
described in the ANSI SCSI-1, SCSI-2 and SCSI-3 Interface Specifi-
cations to the extent described in this product manual (Vol. 1),
which defines the product performance characteristics of the Hawk
4 Family of drives, and the SCSI Interface Product Manual P/N
77738479 (Vol. 2, Version 2) which describes the general interface
characteristics of this and other families of Seagate 3.5-inch
drives. The drive interface supports multiple initiators,
disconnect/reconnect, self configuring host software and automatic
features that relieve the host from the necessity of knowing the
physical characteristics of the targets (logical block addressing is
used). The Head/Disc Assembly (HDA) is environmentally sealed at the
factory. Air recirculates within the HDA through a nonreplaceable
filter to maintain a contamination free head/disc environment.
NEVER disassemble the Head/Disc Assembly (HDA). This exploded view
is for information only. Do not attempt to service items in the
sealed environmental enclosure (heads, media, actuator, etc.) as
this requires special facilities. The drive contains no parts
replaceable by the user. The drive warranty is voided if the HDA
is opened.
The Hawk 4 Family (Wide) drives use a dedicated landing zone at the
innermost radius of the media to eliminate the possibility of
destroying or degrading data by landing in the data zone. The
drive automatically goes to the landing zone when the power is
removed.
The Hawk 4 Family (Wide) drives incorporate an automatic shipping
lock which prevents potential damage to the heads and discs that
result from movement during shipping and handling. The shipping
lock disengages when power is applied to the drive and the head
load process begins.
The Hawk 4 Family (Wide) drives decode Track 0 location from the
dedicated servo surface to eliminate mechanical transducer
adjustments and related reliability concerns.
The Hawk 4 Family (Wide) drives use a high performance actuator
assembly that consists of a low inertia, balanced, patented,
straight arm design that provides excellent performance with
minimum power dissipation.
Standard features
-----------------
- The Hawk 4 Family (Wide) has the following standard features:
- Integrated SCSI Controller
- Single Ended and Differential SCSI drivers and receivers
- Asynchronous and Synchronous data transfer protocol
- Firmware downloadable via SCSI interface
- Selectable sector size from 256 to 4096 bytes/sector
- Programmable sector reallocation scheme
- Flawed sector reallocation at format time
- Programmable auto write and read reallocation
- Reallocation of defects on command (Post Format)
- 96 bit Reed-Solomon error correcting code
- Sealed Head/Disc Assembly
- No preventative maintenance or adjustment required
- Dedicated head landing zone
- Automatic shipping lock
- Automatic Adaptive Thermal Compensation
- Patented Tri-Phase Servo with embedded Grey Code track address to
- guarantee servo positioning.
- Self diagnostics performed at power on
- 1:1 Interleave
- Zoned Bit Recording (ZBR)
- Vertical, horizontal, or top down mounting
- Dynamic spindle brake
- 512 K byte data buffer
- Permanently mounted terminators (for model ST15230W only), enabled
by installation of a jumper plug.
Performance
-----------
- Programmable multi-segmentable cache buffer
- 5411 r/min Spindle.
- Average latency = 5.54 ms
- Command Queuing of up to 64 commands per initiator
- Background processing of queue
- Supports start and stop commands
- Low audible noise for office environment
- Low power consumption
Reliability
-----------
- 800,000 hour MTBF
- Adaptive seek velocity.
- Improved seek performance
- LSI circuitry
- Balanced low mass rotary voice coil actuator
- 5 year warranty
Formatting
----------
It is not necessary to low level format this drive. The drive is
shipped from the factory low level formatted in 512 byte sectors.
Reformat the drive if one of the following occurs.
- A different sector size is selected.
- A different spare sector allocation scheme is selected.
High level format the drive. This involves assigning one or more
partitions or logical drives to the drive volume. Follow the
instructions in the system manuals for the system into which the
drive is to be installed.
Start/stop time
---------------
After DC power has been applied, the drive becomes ready within 25
seconds if the Motor Start Option is disabled (i.e. the motor starts
as soon as the power has been applied). During this time the drive
responds to some commands over the SCSI interface* in less than 3
seconds. Stop time is less than 20 seconds from removal of DC power.
If the Motor Start Option is enabled the internal controller accepts
the commands listed in the SCSI Interface Product Manual less than 3
seconds after DC power has been applied. After the Motor Start
Command has been received the drive becomes ready for normal
operations within 25 seconds. The Motor Start Command can also be
used to command the drive to stop the spindle.
There is no power control switch on the drive.
Prefetch/multi-segmented cache control
--------------------------------------
The drive provides prefetch (read look-ahead) and multi-segmented
cache control algorithms that in many cases can enhance system
performance. "Cache" as used herein refers to the drive buffer
storage space when it is used in "cache" operations. To select
prefetch and cache features the host sends the Mode Select command
with the proper values in the applicable bytes in Mode Page 08h.
Prefetch and cache operation are independent features from the
standpoint that each is enabled and disabled independently via
the Mode Select command. However, in actual operation the prefetch
feature overlaps cache operation.
Cache operation
---------------
In general, 448 Kbytes of the 512 Kbytes of physical buffer space in
the drive can be used as storage space for cache operations. The
buffer can be divided into logical segments (Mode Select Page 08h,
byte 13) from which data is read and to which data is written. The
drive maintains a table of logical block disk medium addresses of
the data stored in each segment of the buffer. If cache operation
is enabled (RCD bit = 0 in Mode Page 08h, byte 2, bit 0. See SCSI
Interface Product Manual), data requested by the host with a Read
command is retrieved from the buffer (if it is there), before any
disc access is initiated. If cache operation is not enabled, the
buffer (still segmented with required number of segments) is still
used, but only as circular buffer segments during disc medium read
operations (disregarding Prefetch operation for the moment). That
is, the drive does not check in the buffer segments for the
requested read data, but goes directly to the medium to retrieve
it. The retrieved data merely passes through some buffer segment
on the way to the host. For a cache miss, all data transfers to
the host are in accordance with "buffer-full" ratio rules. On a
cache hit the drive ignores the buffer full ratio. See
explanations associated with Mode page 02h (disconnect/reconnect
control) in the SCSI Interface Product Manual.
The following is a simplified description of a read operation with
cache operation enabled:
Case A - A Read command is received and the first logical block (LB)
is already in cache:
1. Drive transfers to the initiator the first LB requested plus all
subsequent contiguous LB's that are already in the cache. This
data may be in multiple segments.
2. When the requested LB is reached that is not in any cache
segment, the drive fetches it and any remaining requested LB's
from the disc and puts them in a segment of the cache. The drive
transfers the remaining requested LB's from the cache to the
host in accordance with the disconnect/reconnect specification
mentioned above.
3. If the prefetch feature is enabled, refer to section 5.5.2 for
operation from this point.
Case B - A Read command requests data, the first LB of which is not
in any segment of the cache:
1. The drive fetches the requested LB's from the disc and transfers
them into a segment, and from there to the host in accordance
with the disconnect/reconnect specification referred to in case A.
2. If the prefetch feature is enabled, refer to section 5.5.2 for
operation from this point. Each buffer segment is actually a self-
contained circular storage (wraparound occurs), the length of
which is an integer number of disc medium sectors. The wraparounds
capability of the individual segments greatly enhances the
buffer's overall performance as a cache storage, allowing a
wide range of user selectable configurations, which includes
their use in the prefetch operation (if enabled), even when
cache operation is disabled.
The number of segments may be selected using the Mode Select
command, but the size can not be directly selected. Size is
selected only as a by-product of selecting the segment number
specification. The size in Kbytes of each segment is reported
by the Mode Sense command page 08h, bytes 14 and 15. If a size
specification is sent by the host in a Mode Select command
(bytes 14 and 15) no new segment size is set up by the drive,
and if the "STRICT" bit in Mode page 00h (byte 2, bit 1) is set
to one, the drive responds as it does for any attempt to change
unchangeable parameters (see SCSI I/O Product Manual).
The ST15230 family of drives supports operation of any integer
number of segments from 1 to 16.
Prefetch operation
------------------
If the Prefetch feature is enabled, data in contiguous logical
blocks on the disc immediately beyond that which was requested
by a Read command can be retrieved and stored in the buffer for
immediate transfer from the buffer to the host on subsequent
Read commands that request those logical blocks (this is true
even if "cache" operation is disabled). Though the prefetch
operation uses the buffer as a "cache", finding the requested
data in the buffer is a prefetch "hit", not a "cache" operation
"hit". Prefetch is enabled using Mode Select page 08h, byte 12,
bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0 enables prefetch.
Since data that is prefetched replaces data already in some buffer
segment(s), the host can limit the amount of prefetch data to
optimize system performance.
The max prefetch field (bytes 8 and 9) limits the amount of prefetch.
The drive does not use the prefetch "ceiling field" (bytes 10 and
11).
During a prefetch operation, the drive crosses a cylinder boundary to
fetch more data only if the Discontinuity (DISC) bit is set to one in
bit 4 of byte 2 of Mode parameters page 08h.
Whenever prefetch (read look-ahead) is enabled (enabled by DRA = 0),
it operates under the control of ARLA (Adaptive Read Look-Ahead).
If the host uses software interleave, ARLA enables prefetch of
contiguous blocks from the disk when it senses that a prefetch
"hit" will likely occur, even if two consecutive read operations
were not for physically contiguous blocks of data (e.g. "software
interleave"). ARLA disables prefetch when it decides that a prefetch
"hit" will not likely occur. If the host is not using software
interleave, and if two sequential read operations are not for
contiguous blocks of data, ARLA disables prefetch, but as long as
sequential read operations request contiguous blocks of data, ARLA
keeps prefetch enabled.
Write errors
------------
Write errors can occur as a result of media defects, environmental
interference, or equipment malfunction. Therefore, write errors are
not predictable as a function of the number of bits passed.
If an unrecoverable write error occurs because of an equipment
malfunction in the drive, the error is classi-fied as a failure
affecting MTBF. Unrecoverable write errors are those which cannot
be corrected within two attempts at writing the record with a read
verify after each attempt (excluding media defects).
Seek errors
-----------
A seek error is defined as a failure of the drive to position the
heads to the addressed track. There shall be no more than one
recoverable seek error in 10 7 physical seek operations. After
detecting an initial seek error, the drive automatically reseeks
to the addressed track up to 3 times. If a reseek is successful,
the Extended Sense reports a seek positioning error (15h), no seek
complete error (02h), or track follow error (09h), and the sense
key reports a recovered error (1h). If all three reseeks fail, a
seek positioning error (15h) is reported with a Medium (3h) or
Hardware error (4h) reported in the Sense Key. This is an
unrecoverable seek error. Unrecoverable seek errors are classified
as failures for MTBF calculations. Ref. section 5.1.1.2 of SCSI-2
Interface Product Manual P/N 77738479 for Request Sense command
information.
Preventive maintenance
----------------------
No routine scheduled preventive maintenance shall be required.
Service life
------------
The drive shall have a useful service life of five years. Depot
repair or replacement of major parts is permitted during the
lifetime.
Service philosophy
------------------
Special equipment is required to repair the drive HDA. In order to
achieve the above service life, repairs must be performed only at a
properly equipped and staffed service and repair facility.
Troubleshooting and repair of PCBs in the field is not recommended,
because of the extensive diagnostic equipment required for effective
servicing. Also, there are no spare parts available for this drive.
Drive warranty is voided if the HDA is opened.
Defect and error management
---------------------------
The drive, as delivered, complies with this specification. The read
error rate and specified storage capacity are not dependent upon use
of defect management routines by the host (initiator).
Defect and error management in the SCSI system involves the drive
internal defect/error management and SCSI systems error
considerations (errors in communications between Initiator and
the drive). Tools for use in designing a defect/error management
plan are briefly outlined in this section, with references to other
sections where further details are given.
Options
-------
All options are incorporated or packaged at the manufacturing
facility.
Front panel
-----------
The normal front panel available is black plastic. Other panel
colors may be special ordered. Each panel has a single rectangular
green LED indicator lens which, when glowing, indicates the drive
is selected.
Single unit shipping pack
-------------------------
The drive is normally shipped in bulk packaging to provide maximum
protection against transit damage. Units shipped individually
require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should
specify this option.
**********************************************************************
G E N E R A L
**********************************************************************
SEAGATE SUPPORT SERVICES
Seagate Technology
------------------
Technical Support Services
If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and can
help you with system conflicts and other technical issues. If you
need additional assistance with your Seagate(r) drive or other
Seagate products, use one of the Seagate technical support services
listed below.
SeaFONE at 1-800-SEAGATE (1-800-732-4283)
Seagate's 800 number allows toll-free access to automated self-help
services, providing answers to commonly asked questions,
troubleshooting tips and specifications for disc drives and tape
drives. This service is available 24 hours daily and requires a
touch-tone phone. If you need to speak to a technical support
engineer, dial this number and listen to the options for technical
support. (International callers can also reach this automated
self-help service by dialing 408-456-4496).
Seagate Technology online services
Using a modem, you can obtain troubleshooting tips, free utility
programs, drive specifications and jumper settings for Seagate's
entire product line. You can also download software for installing
and analyzing your drive.
SeaNET
You can obtain technical information on Seagate drives, Seagate
software and much more over the Internet from Seagate's World Wide
Web home page (http://www.seagate.com) or Seagate's ftp server
(ftp://ftp.seagate.com).
You may also send E-mail with your questions to DiscSupport@
Seagate.com or TapeSupport@Seagate.com.
SeaBOARD
SeaBOARD is a computer bulletin board system (BBS) that contains
information about Seagate's disc and tape drive products and is
available 24 hours daily. Set your communications software to eight
data bits, no parity and one stop bit (8-N-1). SeaBOARD phone numbers
are listed in the following table.
BBS Location Modem number
United States Disc: 408-434-1080; Tape: 408-456-4415
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore 65-292-6973
Thailand 662-531-8111
Australia 61-2-9756-2359
Taiwan 886-2-719-6075
Seagate CompuServe forum
Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type go seagate.
This forum provides information similar to that found on SeaBOARD.
In addition, you can type questions or browse through previous
questions and answers on the forum messages.
Seagate Technology FAX services
SeaFAX
You can use a touch-tone telephone to access Seagate's automated FAX
system to receive technical support information by return FAX. This
service is available 24 hours daily.
Location Telephone number
United States 1-800-SEAGATE or 408-456-4496
England 44-1628-894084
Australia 61-2-9756-5170
Seagate technical support FAX
You can FAX questions or comments to technical support specialists 24
hours daily. Responses are sent during business hours.
Location FAX number
United States 408-944-9120
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Australia 61-2-9725-4052
Singapore 65-293-4722
Hong Kong 852-2368 7173
Taiwan 886-2-715-2923
Korea 82-2-556-7294/4251
Seagate technical support
You can talk to a technical support specialist during business hours
Monday through Friday for one-on-one technical help. Before calling,
note your system configuration and drive model number (STxxxx). There
are several technical support phone numbers available for various
Seagate products.
Location Telephone number
United States Please dial 1-800-SEAGATE for the specific product
telephone number.
(6:00 A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M.,
Pacific time, M-F)
England 44-1628-894083 (10:00 A.M. to 1:00 P.M., 2:00 P.M. to
5:00 P.M., M-F)
France 33 1-41 86 10 86 (9:30 A.M. to 12:30 P.M., 2:00
P.M. to 5:00 P.M., M-F)
Germany Disc: 49-89-140-9332; (9:30 A.M. to 12:30 P.M., 2:00
P.M. to 4:00 P.M., M-F)
Tape: 49-89-140-9333
Australia 61-2-9725-3366 (9:00 A.M. to 5:00 P.M., M-F)
Singapore 65-290-3998 (9:00 A.M. to 12:00 P.M., 2:00
P.M. to 5:00 P.M., M-F)
Hong Kong 852-2368 9918
Taiwan 886-2-514-2237
Korea 82-2-556-8241
SeaTDD 408-944-9121
Using a telecommunications device for the deaf (TDD), you can send
questions or comments 24 hours daily and exchange messages with a
technical support specialist between 6:00 A.M. to 11:15 A.M. and
12:30 P.M. to 5:00 P.M. (Pacific time) Monday through Friday.
Customer Service Centers
Seagate direct OEM, Distribution, System Integrator and Retail
customers should contact your Seagate Service Representative for
warranty information. Other customers contact your place of
purchase. Seagate offers comprehensive customer support for all
Seagate drives. Seagate customer service centers are the only
facilities authorized to service Seagate drives. These services are
available worldwide.
Location Telephone number FAX number
United States 1-800-468-3472; 405-949-6740
Other Americas
(Canada & Brazil) 405-949-6706; 405-949-6738
Mexico 525-546-6965; 525-546-4888
Europe, Middle
East & Africa 31-2065-43300; 31-2065-34320
Asia Pacific &
Australia 65-485-3595; 65-485-4980
Japan 81-3-5462-2904; 81-3-3462-2979
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc. SeaFAX, SeaFONE, SeaBOARD,
SeaTDD, SeaNET, Medalist and DiscWizard are either trademarks or
registered trademarks of Seagate Technology, Inc. or one of its
subsidiaries. All other trademarks or registered trademarks are the
property of their respective owners.