
S T 9 0 5 1 A    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 2.5"/SUPERSLIMLINE    Cylinders     654|  820|     |
Capacity form/unform    43/      MB        Heads           4|    6|   15|
Seek time   / track  19.0/ 6.0 ms          Sector/track   32|   17|   63|
Controller           IDE / AT              Precompensation
Cache/Buffer            32 KB              Landing Zone
Data transfer rate    1.250 MB/S int       Bytes/Sector      512
                      4.000 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5 V          Temperature *C         5 55    |    -40 70
Power: sleep          0.3 W     Humidity     %         8 80    |      5 95
       standby        0.3 W     Altitude    km    -0.305  3.048| -0.305 12.192
       idle           0.8 W     Shock        g        10       |    150
       seek           1.6 W     Rotation   RPM      3631
       read/write     1.7 W     Acoustic   dBA        33
       spin-up        3.9 W     ECC        Bit
                                MTBF         h     150000
                                Warranty Month        12
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,IEC435,IEC9...



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                        L   A   Y   O   U   T
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SEAGATE  ST9051/9052/9077/9096/9144-A  PRODUCT MANUAL 36186-002, B

  +--------------------------------------------------------+43 Ground
  |                                                        |XX Power
  |                                                        |XX p.41/42
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  |                                                        |.X
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  |                                                        |XX
  |                                                        |X1
  |                                                        |
  |                                                        |+-+ Master
  |                                                        || | Slave
  +--------------------------------------------------------++-+ Jumper



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SEAGATE  ST9051/9052/9077/9096/9144-A  PRODUCT MANUAL 36186-002

 Jumper Setting
 ==============

 Master/Slave selection
 ----------------------
       Jumper
      +------+
      | A  C |
      | B  D |
      +------+

   Jumper for Pins        Configuration
   A and B   C and D
   ------------------------------------------------------------------
   OPEN      OPEN       Drive is Master, no Slave present
   OPEN      CLOSED     Drive is Master, Seagate Slave drive present*
   CLOSED    OPEN       Drive is Slave to another ST9144A Family
                        Master Drive
   CLOSED    CLOSED     Reserved Position (Do not use)


 * ST157A, ST1144A, ST351A, and ST3144A drive families.

 A master/slave relationship must be established between drives on the
 AT bus. Drive 1 is configured as the Master and Drive 2 is configured
 as the Slave.



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SEAGATE  ST9051/9052/9077/9096/9144-A  PRODUCT MANUAL 36186-002 B

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

 Drive mounting ST9051A, ST9077A
 --------------------------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
                         |  |     | |     |  | ||      x  x      ||
 +---------------------+ |  +-----+ +-----+  | ||       xx       ||
 +-+-----------------+-+ +--+             +--+ ||     x    x     ||
   |                 |                         ||   x        x   ||
   |                 |                         || x            x ||
   +-----------------+                         |x                x|
                                              x++----------------++x
                                                 Not Recommended !


 Drive mounting  ST9052A, ST9096A, ST9144A
 ------------------------------------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  |
   |                 |   |  |     | |     |  | |+----------------+|
 +-+-----------------+-+ |  |     | |     |  | ||                ||
 +---------------------+ |  |     | |     |  | ||                ||
                         |  |     | |     |  | ||                ||
                         |  |     | |     |  | ||                ||
 +---------------------+ |  +-----+ +-----+  | ||                ||
 +-+-----------------+-+ +--+             +--+ ||                ||
   |                 |                         ||                ||
   |                 |                         ||                ||
   +-----------------+                         ||                ||
                                               ++----------------++

 You can mount the drives in any of the approved orientations. Allow
 a minimum clearance of 0.030-inches should be allowed around the
 entire perimeter of the drive for cooling airflow.


 The ST9051A and ST9077A are built with metric mounting screw threads.
 Drives with metric threads can be distinguished by a notch in the
 mounting boss. Screw insertion depth is limited to 0.150 inches (3.81
 mm) maximum on the side mounting holes and 0.190 inches (4.82 mm)
 maximum on the bottom mounting holes. The screw size allowed for the
 bottom-mounting and the side-mounting holes is M3X0.5.

 Note: Earlier versions of the ST9051A were built with standard
 threads, size 4-40 UNC-2B. Drives with standard threads do not have a
 notch cut into the mounting boss.

 Caution: Do not exceed 3 inch-Ibs torque for mounting screws.


 The ST9052A, ST9096A and ST9144A are built with metric mounting screw
 threads. Screw insertion depth is limited to 0.15 inches (3.81 mm)
 maximum on the side mounting holes and 0.19 inches (4.82 mm) maximum
 on the bottom mounting holes. The screw size allowed for the
 bottom-mounting and the side-mounting holes is M3X0.5.

 Caution: Do not exceed 3 inch-Ibs torque for mounting screws.


 AT interface
 ------------
 The ST9144 family AT drives use the industry-standard IBM AT task
 file interface. The drives support both 8-bit and 16-bit data
 transfer and have no DMA capability. All data transfers are done
 through programmed I/O.

 Up to two drives can be daisy-chained (Master/Slave) on the same
 host bus.


 AT interface cable
 ------------------
 Maximum cable length is 18 inches (457 mm). It is recommended that
 the connectors be keyed by inserting a plug into the pin-20 location
 of each interface connector.


 AT interface connector requirements
 -----------------------------------
 The drive connector is a 44-conductor connector with 2 rows of 22
 male pins on 0.079 inch (2 mm) centers. The mating cable connector is
 a 44-conductor nonshielded connector with 2 rows of 22 female
 contacts on 0.079 inch (2 mm) centers. It is recommended that the
 connectors be keyed by inserting a plug into the pin 20 location of
 each interface connector. Strain relief is recommended.

 Recommended connector: Molex part number 87259-4413 or equivalent.


 DC power specifications
 -----------------------
 Power is supplied to the drive through pin 41 and pin 42, ground
 through pin 43 in the interface connector. Pin 44 is reserved.


 Remote LED
 ----------
 The drive indicates activity to the host through the /DASP line (pin
 39) on the AT interface. This line may be connected to a drive status
 indicator driving an LED to 5 VDC. This line has a 30 mA nominal
 current limit.


 Shipping zone
 -------------
 At power-down the read/write heads automatically move to the shipping
 zone. The head and slider assembly park indide of the maximum data
 cylinder.


 Input Noise
 -----------
 Maximum permitted input noise ripple   150 mV (peak-to-peak)
 Maximum permitted input noise          10 MHz


 Onboard drive diagnostics
 -------------------------
 At power-on the drive executes a series of diagnostics tests. A
 series of LED flashes on the system panel indicates a failure.

   Error Codes
   LED Flashes   Drive Error Condition
   ------------------------------------------
       1         80C198 Microprocessor Error
       2         80C198 ROM Checksum Error
       3         AT Interface Chip Error
       5         External RAM Error
       6         Buffer RAM Error



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SEAGATE  ST9051/9052/9077/9096/9144-A  PRODUCT MANUAL 36186-002 B

 UL/CSA listing
 --------------
 The ST9144 family drives are listed in accorance with UL 1950 and CSA
 C22.2 (950-M-89), and meet all applicable sections of IEC 380, IEC
 435, IEC 950, VDE 0806/08.81 and EN 60950 as tested by TUV-Rheinland,
 North America.

 Warning: The ST9144 family drives are devices intended to be contain-
 ed solely within a personal computer or similar enclosure and not
 attached as an unenclosed external device. As such, the drive is
 considered to be a subassembly even when it is individually marketed
 to the customer.


 Acoustics
 ---------
 ST9052A: 30dBA maximum (sound pressure) in Idle mode, at 1 meter.

 All other ST9144 family drives: 33 dBA maximum (sound pressure) in
 Idle mode, at 1 meter.


 Seek time definition
 --------------------
 Seek time is a true statistical average (at least 5,000 measurements)
 of seek time, less overhead. All measurements are made with nominal
 power at sea level and 25*C ambient temperature.

 Track-to-track seek time is an average of all possible single-track
 seeks in both directions. Average seek time is measured by executing
 seek commands between random sector addresses.

 Full-stroke seek time is one-half the time needed to seek from the
 first data sector to the maximum data sector and back to the first
 sector.

 Note. Host overhead varies between systems and cannot specified.
 Controller overheads for the drives is 1 msec typical.


 Seek Time                                |       |ST9144A|        |
 ---------                                |       |ST9096A|        |
                                          |ST9051A|ST9052A|ST9077A |
        ----------------------------------+-------+-------+--------+
        Track-to-Track         msec. typ. |  6    |   5   |   5    |
                               msec. max. |  8    |   8   |   8    |
                       Average msec. typ. | 19    |  16   |  16    |
                       Average msec. max. | 20    |  19   |  19    |
        Full-stroke            msec. typ. | 36    |  27   |  27    |
                               msec. max. | 38    |  30   |  30    |
        Latency                msec. avg. |  8.26 |   8.70|   8.46 |
        ----------------------------------+-------+-------+--------+


 AT bus signal levels
 --------------------
 Signals driven by the drive must have the following output character-
 istics at the drive connector:

 Logic Low      0 to 0.4  VDC
 Logic High   2.5 to 5.25 VDC

 Signals received by the drive must have the following input
 characteristics, measured at the drive connector:

 Logic Low      0 to 0.8  VDC
 Logic High   2.0 to 5.25 VDC


 Reliability
 -----------
 MTBF          150,000 POH (nominal power, at sea level, 25*C ambient
               temperature).
 PM            Not required
 MTTR          10 minutes
 Service Life  5 years


