S T 3 5 5 0 N SEAGATE
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/SLIMLINE Cylinders | | |
Capacity form/unform 456/ MB Heads 5| | |
Seek time / track 12.0/ 4.0 ms Sector/track | | |
Controller SCSI2 SI/FAST Precompensation
Cache/Buffer 256 KB SEGMENTED Landing Zone
Data transfer rate 4.000 MB/S int Bytes/Sector 512
10.000 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 % |
standby 1.0 W Altitude km |
idle 3.0 W Shock g |
seek 5.0 W Rotation RPM 4500
read/write 5.8 W Acoustic dBA
spin-up W ECC Bit
MTBF h 250000
Warranty Month 24
Lift/Lock/Park YES Certificates IEC950,VDE
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L A Y O U T
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SEAGATE ST3550N INSTALLATION GUIDE 36196-002, REV. A, 1992
+---------------------------------------------------------+
| +---+J5 |XX
| +---+ |XX
| ++ |XX
| || |XX
| || |XX
| 1++ |XX
| ++ |XX
|+--+ Terminator || |XX
|| | Resistor || |XX
|| | Packs 1++ |XX J4
|+--+J12 ++ |XX I/O
|+--+ || |XX
|| | || |X1
|| |J8 1++ |
|| | |XX
|| | J9+------+ +--+J6 |XX Power
|+--+ +------+ +--+ |XX J3
+---------------------------------------------------------+
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J U M P E R S
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SEAGATE ST3550N INSTALLATION GUIDE 36196-002, REV. A, 1992
Jumper setting
==============
J3 DC Power and Pin Connector Assignment
-----------------------------------------
--+------------+--Circuit board
| 1 2 3 4 |
+-+--+--+--+-+
| | | +----- + 5 VDC
| | +-------- + 5 Volts Return
| +----------- +12 Volts Return
+-------------- +12 VDC
J5 SCSI ID Address Jumper Block
--------------------------------
Ground -+-2--4--6-+--Circuit Board-+---------+--
MSB | o o o | SCSI ID = 0 | o o X | SCSI ID = 1
Signal | o o o | | o o X |
+-1--3--5-+ +---------+
Ground -+---------+-- -+---------+--
MSB | o X o | SCSI ID = 2 | o X X | SCSI ID = 3
Signal | o X o | | o X X |
+---------+ +---------+
Ground -+---------+-- -+---------+--
MSB | X o o | SCSI ID = 4 | X o X | SCSI ID = 5
Signal | X o o | | X o X |
+---------+ +---------+
Ground +---------+ +---------+
MSB | X X o | SCSI ID = 6 | X X X | SCSI ID = 7
Signal | X X o | | X X X |
+---------+ +---------+
If you are installing only one drive, use SCSI ID 0 (no jumper
installed). If you install a second drive, you can use any ID (SCSI
ID 1 is recommended).
WARNING
If you install SCSI ID jumpers on both the SCSI ID jumper block and
the user-configuration jumper block (pins 1-6), the drive may not
function properly.
J6 Terminator Power Source Jumper Block
---------------------------------------
--+3--1+--Circuit Board
|o o|
|o o|
+4--2+
+3--1+ From SCSI +3--1+ From Power +3--1+ To SCSI Connector
|o X| Conector |xxxx| Connector |X o| Only
|o X| |o o| |X o|
+4--2+ +4--2+ +4--2+
+3--1+ From Power +3--1+ Terminating
|X X| Connector |o o| Resistors
|X X| and to SCSI |xxxx| not Installed
+4--2+ Bus +4--2+
To select the drive power connector as the termination power source
for the resistor packs, install a jumper on pins 1 and 3 of the
terminator power source jumper block.
To select the SCSI connector as the termination power source for the
resistor packs, install a jumper on pins 1 and 2 of the terminator
power source jumper block.
To provide terminator power to the SCSI connector from the drive
power connector only, install a jumper on pins 3 and 4 of the
terminator power source jumper block.
To provide terminator power to the SCSI connector and the drive
terminator packs, install jumpers on pins 1 and 2 and pins 3 and 4 of
the terminator power source jumper block.
Terminating resistors
---------------------
I/O termination consists of three resistor packs, called terminators,
that plug into sockets on the printed circuit board.
If you are installing only one drive, leave the terminators
installed. If you are installing multiple drives, remove the
terminators from all drives except the drive connected to the end of
the cable.
NOTE
Removing the terminator power source selection jumper does not
disconnect the terminator resistors from the circuit. If your
application requires no terminators, you must physically remove the
terminators from the drive circuit board.
J8 User configuration Jumper Block
-----------------------------------
19 17 15 13 11 9 7 5 3 1
--+------------------------------+--Circuit Board
| o o o o o o o o o o |
| o o o o o o o o o o |
+------------------------------+
20 18 16 14 12 10 8 6 4 2
SCSI ID = 0 SCSI ID = 1 SCSI ID = 2
--5--3--1-+- --5--3--1-+- --5--3--1-+-
LSB o o o |MSB LSB X o o |MSB LSB o X o |MSB
o o o o | o X o o | o o X o |
----6--4--2-+ ----6--4--2-+ ----6--4--2-+
SCSI ID = 3 SCSI ID = 4 SCSI ID = 5
--5--3--1-+- --5--3--1-+- --5--3--1-+-
LSB X X o |MSB LSB o o X |MSB LSB X o X |MSB
o X X o | o o o X | o X o X |
----6--4--2-+ ----6--4--2-+ ----6--4--2-+
SCSI ID = 6 SCSI ID = 7
--5--3--1-+- --5--3--1-+-
LSB o X X |MSB LSB X X X |MSB
o o X X | o X X X |
----6--4--2-+ ----6--4--2-+
WARNING
If you install SCSI ID jumpers on both the SCSI ID jumper block and
the user-configuration jumper block (pins 1-6), the drive may not
function properly.
Pin Function
-------------------------------------
7 Ext. spindle sync.
8 Clock Ground
9 Remote LED+
10 Remote LED-
NOTE
Pins 11-20 are reserved. DO NOT USE.
J9 Active/Passive termination jumper block
------------------------------------------
---+-5--3--1-+-Circuit board
| o o X |
| o o X | +2.85 V to 110 ohms
+-6--4--2-+
---+-5--3--1-+-Circuit board
| X o o |
| X xxxx | Power and ground to 220/330 ohms
+-6--4--2-+
If you removed the terminating resistors from the drive according to
the instructions in the previous step, skip this step.
If you are using Fast SCSI transfer rates, use the default Active/
Passive Termination jumper setting. If you are not using fast SCSI
transfer rates and both ends of the I/O cable are terminated by
resistors of equal value, also use the default setting.
If the host adapter contains 220/330-Ohm resistors that cannot be
removed and replaced with 110-Ohm resistors, set the drive
termination power option to "Power and Ground" to 220/330 Ohms".
Remove the jumper from Pins 1 and 2 and install jumpers on Pins 2 and
4 and Pins 5 and 6 of the Active/Passive Termination jumper block.
Then, replace the 110-Ohm terminators provided with the drive with
220/330-Ohm terminators.
The jumper settings and terminology for active and passive termina-
tion are summarized in the table below.
+---------------------+-------------+------------------------------+
| |Fast SCSI |SCSI |
+---------------------+-------------+------------------------------+
|Termination |Active |Active or passive |
+---------------------+-------------+------------------------------+
|Terminator |110 ohms |110 ohms or 220/330 ohms |
|specification | | |
+---------------------+-------------+------------------------------+
|Install active/ | | |
|passive termination |Pins 1 and 2 |Pins 1 and 2 or Pins 2 and 4 |
|jumpers | | Pins 5 and 6 |
+---------------------+-------------+------------------------------+
J12 Options jumper block
-------------------------
Pin Function
+-7--5--3--1-+ 1 Ground
--+ o o o o +--Circuit Board 2 Parity enable
| o o o o | 3 Ground
+-8--6--4--2-+ 4 Remote start enable
5 Clock ground
6 External spindle sync.
7 Remote LED-
8 Remote LED+
Spindle synchronization
-----------------------
You can synchronize the spindle motors of an array of drives by
connecting a twisted pair to each drive. The maximum cable length is
6 feet (1.8 meters).
Spindle synchronization pins are located on two separate jumper
blocks: the options jumper block and the user-configuration jumper
block. Use either jumper block to synchronize an array of drives, as
follows:
User-configuration Jumper Block
Use one strand of the twisted pair to connect together Pin 7 of the
user-configuration jumper block of each drive. Use the other strand
to connect together pin 8 of the user-configuration jumper block of
each drive.
Options Jumper Block
Use one strand of the twisted pair to connect together pin 5 of the
options jumper block of each drive. Use the other strand to connect
together pin 6 of the options jumper block of each drive.
Install a remote LED
--------------------
Remote LED pins are located on two separate jumper blocks: the
options jumper block and the user-configuration jumper block. Attach
a two-pin remote LED connector to either jumper block, as follows:
- User-configuration jumper block: pins 9 and 10
- Options jumper block: pins 7 and 8
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I N S T A L L
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SEAGATE ST3550N INSTALLATION GUIDE 36196-002, REV. A, 1992
Notes on Installation
=====================
Installation direction
----------------------
horizontally vertically
+-----------------+ +--+ +--+
| | | +-----+ +-----+ |
| | | | | | | |
+-+-----------------+-+ | | | | | |
+---------------------+ | | | | | |
| | | | | |
| | | | | |
+---------------------+ | +-----+ +-----+ |
+-+-----------------+-+ +--+ +--+
| |
| |
+-----------------+
The drive will operate in all axis (6 directions).
Mounting Orientation
--------------------
You can mount the drive in any orientation. Use either bottom mount-
ing holes or side mounting holes.
NOTE
Regardless of which set of holes you use, use only three mounting
screws.
Bottom mounting holes
---------------------
Use 6-32 UNC-2A screws in three of the four available bottom mounting
holes.
CAUTION
Do ot insert the bottom mounting screws more than 0.200 inches (6
turns) into the drive frame. If you use a screw that is too long, you
could damage the drive.
Side mounting holes
-------------------
Use 6-32 UNC-2a screws in three of the six available side mounting
holes. Make sure your installation adheres to the following
guidelines:
- Do not use all three mounting holes on the same side of the drive.
- Use one or both of the following: the side mounting hole near the
power connector or the side mounting hole (on the other side of the
drive) near the interface connector.
- Use at least one, but not more than two, of the other four side
mounting holes.
CAUTION
Do not insert side mounting screws more than 0.125 inches (4 turns)
into the drive frame. If you use a screw that is too long, you could
damage the drive.
Power Connection
----------------
Make sure the system power switch is in the "off" position. Connect
a system power cable to the drive power connector.
Connect the SCSI Cable
----------------------
It might be easier to attach the cable before mounting the drive and
fastening the mounting screws. Use only three mounting screws.
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F E A T U R E S
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SEAGATE ST3550N INSTALLATION GUIDE 36196-002, REV. A, 1992
Low-level formatting the ST3550N
--------------------------------
The ST3550N is low-level formatted at the factory. In most
applications, you do not have to low-level format the drive. Refer
to your host adapter manual to determine whether you need to low-
level format the drive. If so, use the DOS DEBUG utility. The most
common DEBUG command is g=c800:5. Verify the BIOS address (c800) and
the offset (5) with your host adapter manual.
CAUTION
If you format a drive at any level, you erase all your data. Back up
the drive first. Seagate assumes no liability for lost user data.
Maintenance and repair
----------------------
Seagate drives do not require any preventive maintenance. The head/
disc assembly is sealed and does not contain any user-serviceable
components. Tampering with the factory seal voids the warranty.
Seagate customer service centers are the only facilities authorized
to service Seagate drives. Seagate does not sanction any third-party
repair facilities.
Shipping
--------
Keep your original box and packing materials for transporting or
shipping your drive. The box has a Seagate Approved Package Label.
Shipping a drive in a nonapproved container voids the warranty. Call
your authorized Seagate distributor to purchase additional boxes.