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Hard Drive: SEAGATE: ST351A 43MB 3.5"/SL IDE / AT




S T 3 5 1 A    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders     904|  820|     |
Capacity form/unform    43/      MB        Heads           2|    6|     |
Seek time   / track  31.5/10.0 ms          Sector/track   17|   17|     |
Controller           IDE / AT              Precompensation
Cache/Buffer             8 KB              Landing Zone
Data transfer rate    1.750 MB/S int       Bytes/Sector      512
                      4.000 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 60
Power: sleep          2.0 W     Humidity     %         8 80    |      5 90
       standby        1.3 W     Altitude    km    -0.305  3.048| -0.305  9.144
       idle               W     Shock        g        10       |     75
       seek           6.5 W     Rotation   RPM      3048
       read/write     5.5 W     Acoustic   dBA        35
       spin-up            W     ECC        Bit
                                MTBF         h     150000
                                Warranty Month        12
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC435,TUV,UL478,VDE 

Layout

SEAGATE ST325/351-A/X DRIVE PRODUCT MANUAL 36145-005, REV. E

  With 3-pin power connector
  +---------------------------------------------------------+
  |                                User         12-------2  |XX 3-pin
  |                                Configuration+--------+  |xx Power
  |                                Jumper block             |XX
  |                                                         |XX AT/XT
  |                                                         |XX Inter-
  |                                                         |XX face
  |                                                         |XX
  |                                                         |.X
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |X1
  |                                                         |
  |                                                         |XX 4-pin
  |                                                         |XX Power
  +---------------------------------------------------------+

  Without 3-pin power connector
  +---------------------------------------------------------+
  |                                User         18--------2 |
  |                                Configuration+---------+ |XX
  |                                Jumper block             |XX
  |                                                         |XX AT/XT
  |                                                         |XX Inter-
  |                                                         |XX face
  |                                                         |.X
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |X1
  |                                                         |
  |                                                         |XX 4-pin
  |                                                         |XX Power
  +---------------------------------------------------------+

Jumpers

SEAGATE ST325/351-A/X DRIVE PRODUCT MANUAL 36145-005, REV. E

Jumper setting
==============

There are two configurations of ST351A/X family drives. Both
configurations can support either interface.

   - The first configuration has a 12-pin User Configuration jumper
     block and two DC power connectors: a 4-pin connector and a 3-pin
     connector.

   - The second configuration has an 18-pin User Configuration jumper
     block and a 4-pin power connector only.

AT jumpers (with 3-pin power connector)
====================================================================

User Configuration jumper block (12-pin)
----------------------------------------

                       +12-10-8--6--4--2+
                       |O  O  O  O  O  O|
                       |O  O  O  O  O  O|
                       +11-9--7--5--3--1+

              +----------------+    +----------------+
  Drive is    |O  O  O  O  O  X|    |O  O  O  O  X  X| Slave drive
  master      |O  O  O  O  O  X|    |O  O  O  O  X  X| present
              +----------------+    +----------------+

              +----------------+    +----------------+
  Drive is    |O  O  O  O  O  O|    |xxxx  O  O  O  O| Bus Reset HIGH
  slave       |O  O  xxxx  O  O|    |O  O  O  O  O  O|
              +----------------+    +----------------+

              +----------------+
  Bus Reset   |X  O  O  O  O  O|
  LOW         |X  O  O  O  O  O|
              +----------------+
 The bus reset active level is systemdependent. You must install a
 jumper in one of these positions for the drive to operate.

              +----------------+    +----------------+
  Drive       |O  O  O  X  O  O|    |O  O  O  O  O  O| Factory test
  activity LED|O  O  O  X  O  O|    |O  xxxx  O  O  O| only (Do Not
  (Optional,  +----------------+    +----------------+ Use)
  master only)

Drive activity LED
------------------
To cause the drive to use the DASP signal to indicate bus activity
through a remote LED, install a jumper on pins 5 and 6. This
jumper can only be installed on the master drive. (On the slave
drive, the DASP- signal indicates that a slave is present.

Factory Test
------------
Not recommended for field use. When a jumper is installed on pins 7
and 9, the actuator continuously seeks between track 0 and the
maximum data track and ignores any signals sent through the inter-
face.

Master/Slave
------------
You can install up to two drives on a single AT bus if you use a
daisy-chain cable. Table below describes how to install the jumpers.

    +----------------+---------+---------+---------+
    |System          | Pins    |         |         |
    |Configuration   | 1 and 2 | 3 and 4 | 5 and 7 |
    +----------------+---------+---------+---------+
    |Only drive in   | CLOSED  |  OPEN   | OPEN    |
    +----------------+---------+---------+---------+
    |Master in a two-|         |         |         |
    |drive system    | CLOSED  |  CLOSED | OPEN    |
    +----------------+---------+---------+---------+
    |Slave in a two- |         |         |         |
    |drive system    | OPEN    |  OPEN   | CLOSED  |
    |system          |         |         |         |
    +----------------+---------+---------+---------+

AT jumpers (without 3-pin power connector)
====================================================================

User Configuration jumper block (18-pin)
----------------------------------------

                     +18-16-14-12-10-8--6--4--2+
                     |O  O  O  O  O  O  O  O  O|
                     |O  O  O  O  O  O  O  O  O|
                     +17-15-13-11-9--7--5--3--1+

        Drive is master              Slave drive present
       +-------------------------+  +-------------------------+
       |O  O  O  O  O  O  O  X  O|  |O  O  O  O  O  O  X  X  O|
       |O  O  O  O  O  O  O  X  O|  |O  O  O  O  O  O  X  X  O|
       +-------------------------+  +-------------------------+

        Drive is slave               Bus Reset HIGH
       +-------------------------+  +-------------------------+
       |O  O  O  O  O  X  O  O  O|  |O  X  O  O  O  O  O  O  O|
       |O  O  O  O  O  X  O  O  O|  |O  X  O  O  O  O  O  O  O|
       +-------------------------+  +-------------------------+

         Bus Reset LOW               Drive activity LED (optional)
       +-------------------------+  +-------------------------+
       |X  O  O  O  O  O  O  O  O|  |O  O  X  O  O  O  O  O  O|
       |X  O  O  O  O  O  O  O  O|  |O  O  X  O  O  O  O  O  O|
       +-------------------------+  +-------------------------+

The bus reset active level is system-dependent. You must install a
jumper in one of these positions for the drive to operate.

         Factory test (Do Not Use)   Factory reserved (Do Not Remove)
       +-------------------------+  +-------------------------+
       |O  O  O  O  O  O  O  O  X|  |O  O  O  X  O  O  O  O  O|
       |O  O  O  O  O  O  O  O  X|  |O  O  O  X  O  O  O  O  O|
       +-------------------------+  +-------------------------+

Drive activity LED
------------------
To cause the drive to use the DASP signal to indicate bus sctivity
through a remote LED, install a jumper on pins 13 and 14. This
jumper can only be installed on the master drive. (On the slave
drive, the DASP- signal is used to indicate that a slave is present.

Factory Test
------------
Not recommended for field use. When a jumper is installed on pins 1
and 2, the actuator continuously seeks between track 0 and the
maximum data track and ignores any signals sent through the inter-
face.

Factory reserved
----------------
Do not remove. At the factory, a jumper was installed on pins 11 and
12 of the User Configuration jumper block. The drive cannot function
properly without it.

Master/Slave
------------
You can install up to two drives on a single AT bus if you use a
daisy-chain cable. Table below describes how to install the jumpers.

    +----------------+---------+---------+----------+
    |System          | Pins    |         |          |
    |Configuration   | 3 and 4 | 5 and 6 | 7 and 8  |
    +----------------+---------+---------+----------+
    |Only drive in   | CLOSED  |  OPEN   |   OPEN   |
    +----------------+---------+---------+----------+
    |Master in a two-|         |         |          |
    |drive system    | CLOSED  |  CLOSED |   OPEN   |
    +----------------+---------+---------+----------+
    |Slave in a two- |         |         |          |
    |drive system    | OPEN    |  OPEN   |   CLOSED |
    |system          |         |         |          |
    +----------------+---------+---------+----------+

XT jumpers (with 3-pin power connector)
====================================================================

User Configuration jumper block (12-pin)
----------------------------------------

                       +12-10-8--6--4--2+
                       |O  O  O  O  O  O|
                       |O  O  O  O  O  O|
                       +11-9--7--5--3--1+

              XT mode (Always         ST325A/X only
              installed)              Full capacity (20 MBytes)
              +----------------+      +----------------+
              |O  O  X  O  O  O|      |O  O  O  O  O  O|
              |O  O  X  O  O  O|      |O  O  O  O  O  O|
              +----------------+      +----------------+

              ST351A/X only           ST351A/X only
              Full capacity (40 MB)   30-MB capacity
              +----------------+      +----------------+
              |O  O  O  O  O  X|      |O  O  O  O  X  O|
              |O  O  O  O  O  X|      |O  O  O  O  X  O|
              +----------------+      +----------------+

              ST351A/X only
              20-MB capacity           Bus Reset HIGH
              +----------------+      +----------------+
              |O  O  O  O  X  X|      |xxxx  O  O  O  O|
              |O  O  O  O  X  X|      |O  O  O  O  O  O|
              +----------------+      +----------------+

              Bus Reset LOW
              +----------------+
              |X  O  O  O  O  O|
              |X  O  O  O  O  O|
              +----------------+

The bus reset active level is system-dependent. You must install a
jumper in one of these positions for the drive to operate.

               Drive activity
               LED (Optional,         Factory test only
               master only)           (Do Not Use)
              +----------------+      +----------------+
              |O  O  O  X  O  O|      |O  O  O  O  O  O|
              |O  O  O  X  O  O|      |O  xxxx  O  O  O|
              +----------------+      +----------------+

Drive capacity options
----------------------
To specify different capacities for the ST351A/X drive install the
jumpers.
You cannot change the capacity of the ST325A/X. Do not install
jumpers on pins 1 and 2 or pins 3 and 4.

Bus Reset (HIGH and LOW)
------------------------
The setting of this jumper depends on the system. A jumper must be
installed in either the HIGH or LOW position for the drive function.

Drive activity LED
------------------
When a jumper is installed on pins 5 and 6, the drive uses the DASP-
signal to indicate bus activity through a remote LED.

Factory Test
------------
Not recommended for field use. When a jumper is installed on pins 7
and 9, the actuator continuously seeks between track 0 and the
maximum data track and ignores any signals sent through the inter-
face.

XT jumpers (without 3-pin power connector)
====================================================================

User Configuration jumper block (18-pin)
----------------------------------------

                     +18-16-14-12-10-8--6--4--2+
                     |O  O  O  O  O  O  O  O  O|
                     |O  O  O  O  O  O  O  O  O|
                     +17-15-13-11-9--7--5--3--1+

     XT mode (Always                  ST325A/X only
     installed)                       Full capacity (20 MBytes)
     +-------------------------+      +-------------------------+
     |O  O  O  O  X  O  O  O  O|      |O  O  O  O  O  O  O  X  O|
     |O  O  O  O  X  O  O  O  O|      |O  O  O  O  O  O  O  X  O|
     +-------------------------+      +-------------------------+

      ST351A/X only                    ST351A/X only
      Full capacity (40 MB)            30-MB capacity
     +-------------------------+      +-------------------------+
     |O  O  O  O  O  O  O  X  O|      |O  O  O  O  O  O  X  O  O|
     |O  O  O  O  O  O  O  X  O|      |O  O  O  O  O  O  X  O  O|
     +-------------------------+      +-------------------------+

      ST351A/X only
      20-MB capacity
     +-------------------------+
     |O  O  O  O  O  O  X  X  O|
     |O  O  O  O  O  O  X  X  O|
     +-------------------------+

      Bus Reset HIGH                   Bus Reset LOW
     +-------------------------+      +-------------------------+
     |O  X  O  O  O  O  O  O  O|      |X  O  O  O  O  O  O  O  O|
     |O  X  O  O  O  O  O  O  O|      |X  O  O  O  O  O  O  O  O|
     +-------------------------+      +-------------------------+

The bus reset active level is system-dependent. A must jumper must be
installed in one of these positions for the drive to operate.

      Drive activity LED               Factory test
      (Optional, master only)          (Do not use)
     +-------------------------+      +-------------------------+
     |O  O  X  O  O  O  O  O  O|      |O  O  O  O  O  O  O  O  X|
     |O  O  X  O  O  O  O  O  O|      |O  O  O  O  O  O  O  O  X|
     +-------------------------+      +-------------------------+

      Factory reserved
      (Do Not Remove)
     +-------------------------+
     |O  O  O  X  O  O  O  O  O|
     |O  O  O  X  O  O  O  O  O|
     +-------------------------+

Bus Reset (HIGH and LOW)
------------------------
The setting of this jumper depends on the system. A jumper must be
installed in either the HIGH or LOW position for the drive function.

Drive activity LED
------------------
When a jumper is installed on pins 13 and 14, the drive uses the
DASP- signal to indicate bus activity through a remote LED.

Factory Test
------------
Not recommended for field use. When a jumper is installed on pins 1
and 2, the actuator continuously seeks between track 0 and the
maximum data track and ignores any signals sent through the inter-
face.

Drive capacity options
----------------------
To specify different capacities for the ST351A/X drive install the
jumpers.
The ST325A/X drive does not offer the option of changing capacity.
Install a jumper on pins 3 and 4 only. Leave pins 5 and 6 open.

--------------------------------------------------------------------

3-pin DC power
--------------

       ---+---------+---
          | 3  2  1 | <--- key
          +-+--+--+-+
            |  |  +------- + 5 VDC
            |  +---------- +12 VDC
            +------------- Ground

4-pin DC power
--------------

      ----+------------+----
          | 4  3  2  1 |
          +-+--+--+--+-+
            |  |  |  +------- +12 VDC
            |  |  +---------- +12 VDC return
            |  +------------- + 5 VDC return
            +---------------- + 5 VDC

Install

SEAGATE ST325/351-A/X DRIVE PRODUCT MANUAL 36145-005, REV. E

Notes on installation
=====================

Drive mounting
--------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x
      PROHIBITED!                                   PROHIBITED!

You must mount the drive within 5* of a vertical or horizontal axis.

Mounting the drive
------------------
For optimum performance, format the drive in the same orientation as
you intend to mount it in the host system. Allow a minimum clearance
of 0.050-inch around the entire drive envelope for cooling airflow
and movement during shock or vibration. Shock mounts placed between
the drive and the host frame should be designed so that the system
has a vertical resonant frequency of 25 Hz or less.

Bottom mounting
---------------
Insert four mounting screws not more than 0.200 inches (6 full turns)
into the drive frame. If you use a screw that is too long, you could
damage the drive.

Standard side mounting
----------------------
Insert four mounting screws not more than 0.125 inches (4 full turns)
into the drive frame. If you use a screw that is too long, you could
damage the drive.

Three-hole side mounting
------------------------
If your system does not allow you to use all four mounting points,
you can mount the drive satisfactorily using only three screws.

Use 6-32 UNC-2A screws on drives with standard-size mounting holes.
These drives have an "S" stamped on the frame runner. Use M4 screws
on drives with metric mounting holes. These drives have an "M"
stamped on the frame runner.

Caution: Be careful not to over-tighten the screws - you could damage
the drive. (Max torque: 6 inch-Ibs).

Acoustics
---------
At a distance of 1 meter, the drive creates a sound pressure of 35
dBA at idle.

Auto-park
---------
Upon power-down, the read/write heads automatically move to the
shipping zone. The heads park inside the maximum data cylinder. When
power is applied, the heads recalibrate to track 0.

AT/XT interface connector
-------------------------
The interface cable connector is a 40-pin connector with two rows of
20 pins on 100 mil centers. The maximum cable length is 18 inches
(0.457 meters). Strain relief is recommended. Recommended cables are
shown below.

AMP P/N 1-499496-0
DuPont P/N 66900-040

A dual-drive AT system requires an AT interface daisy-chani cable. A
dual-drive XT system requires two separate XT interface cables. The
ST351A/X family drives do not use terminating resistors.

Features

SEAGATE ST325/351-A/X DRIVE PRODUCT MANUAL 36145-005, REV. E

AT and XT power-on diagnostics
------------------------------
If an error condition is detected during the power-on diagnostics,
the LED flashes to indicate the cause of the failure.

      LED flash codes
     +--------------------------------------------------------------+
     |Number of                                                     |
     |LED flashes       Description of problem                      |
     +--------------------------------------------------------------+
     |    1             Microprocessor memory failure               |
     +--------------------------------------------------------------+
     |    2             Program ROM memory checksum error           |
     +--------------------------------------------------------------+
     |    5             Program RAM access error                    |
     +--------------------------------------------------------------+
     |    6             Buffer memory access error                  |
     +--------------------------------------------------------------+
     |    7             Drive not ready                             |
     +--------------------------------------------------------------+
     |    8             Error uploading RAM                         |
     +--------------------------------------------------------------+
     |    9             Program RAM not compatible with ROM         |
     +--------------------------------------------------------------+
     |   10             Read/Write sequencer chip diagnostics error |
     +--------------------------------------------------------------+
     |   11             Program RAM checksum error                  |
     +--------------------------------------------------------------+
     |   12             Error uploading defect data                 |
     +--------------------------------------------------------------+
     |   13             Defect data checksum error                  |
     +--------------------------------------------------------------+
     |   17             Spindle failure                             |
     +--------------------------------------------------------------+
     | 18 or 19         Invalid defect tables                       |
     +--------------------------------------------------------------+

 Default logical configuration
 -----------------------------
               ST325A/X      ST351A/X
 Cylinders     615           980
 R/W Heads     4             5
 Sec./track    17            17

Recommended logical configuration
---------------------------------
A wide variety of configurations are available. The configurations
shown below are recommendations. They provide the maximum possible
formatted capacity.

               ST325A/X      ST351A/X
 Cylinders     615           820
 R/W Heads     4             6
 Sec./track    17            17

Maximum logical parameters
--------------------------
All cylinder, head, and sector geometries are limited to:

   - The maximum specified below, and
   - The constraints of the following two relations:

(heads) x (sectors per track) 255
(cylinders) x (heads) x (sectors per track) guaranteed sectors

Cylinders 1,024
Logical heads 16
Sectors per track 128

Reliability
-----------
MTBF power on-hours 150,000
MTTR (minutes) 30
Service life (years) 5

The specification for MTBF, above, assumes nominal power at sea level
and an ambient temperature of 25*C.

Seek Time
---------

                                          | Read   | Write  |
        ----------------------------------+--------+--------+
        Track-to-Track         msec. typ. |   7    |  13    |
                               msec. max. |  12    |  16    |
        Average                msec. typ. |  28    |  35    |
        Average                msec. max. |  36    |  40    |
        Full-stroke            msec. typ. |  65    |  75    |
                               msec. max. |  80    |  85    |
        Latency                msec. avg. |   9.84 |   9.84 |
        ----------------------------------+--------+--------+

Average seek time is atrue statistical average seek time, less over-
head. It is measured by executing at least 5,000 logical read/write
commands between random sector addresses. Track-to-track seek time is
an average of all possible single-track seeks in both directories.
Full stroke seek time is one-half the time needed to seek from the
first data block to the maximum data block and back to the first
block.

All typical measurements assume a block size of 512 bytes, nominal
power at sea level, and an ambient temperature of 25*C. Maximum seek
times are measured over the full range of environmental conditions
and voltage conditions.

Environment
-----------
The ST351A/X family drives are listed in accordance with UL 478 and
CSA (0-M1982) and meet all applicable sections of VDE 0806/08.81 and
IEC 380, as tested by TUV-Rheinland, North America.

 Input noise
 -----------
 The input noise was measured at the host system power supply across
 an equivalent 20-ohm resistance on the +12 VDC line and an equivalent
 8-ohm resistance on the +5 VDC line.

Permitted input noise ripple (max) 100mV (peak-to-peak)
Permitted input noise frequency (max) 20 MHz













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