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                            (C)opyright 1993

ST-11950W SCSI-2 Fast Wide (Barracuda 1) (aka ST-11951N)

                                        J01─────┐
                                       (see    1│┐
╔═══════════╗                           below) └─┘
║ REAR VIEW ║                                  1─┐ ────────J4-1────┐
╚═══════════╝                                  │"│                 |
                                               │"│J4 1-6           │
                                               │"│(see below)      |
                                               ├"┤─J4-6──┐         │
        (TOP)                    J5            └"┘-J4-7┐ |         |
          ___________________  ┌──  ─1┐/═════════\     | |         |
        ═( ╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫1)═│::::::││ 0 0 0 0 ╞═    │ │         │
          \────────────│────/  └  ──  ┘└─5─G─G─12┘     │ │         1
       68 pin I/O Cable┘        ││││││                 : : : : : : :
       Connection               ││││││                 │ │ │ │ │ │ 2
                                ││││││  Reserved ──────┘ │ │ │ │ │ │
Spindle Synch Cable Connector ──┘│││││   (some drives do │ │ │ │ │ │
  (pin-11 SSREF, pin-12 ground)  │││││    not have this  │ │ │ │ │ │
Remote LED Connector ────────────┘││││    #7 jumper)     │ │ │ │ │ │
 [pin-9 cathode (neg),            ││││  Enable Drive ────┘ │ │ │ │ │
  pin-10 anode (pos)]             ││││   Terminators       │ │ │ │ │
                                  ││││  Reserved ──────────┘ │ │ │ │
SCSI ID = 8 ──────────────────────┘│││   (default OFF)       │ │ │ │
SCSI ID = 4 ───────────────────────┘││  Parity Disable ──────┘ │ │ │
SCSI ID = 2 ────────────────────────┘│  Enable Motor Start ────┘ │ │
SCSI ID = 1 ─────────────────────────┘  Delay Motor Start ───────┘ │
SCSI ID = 0 (none)                       (10 sec * ID)             │
                                        Write Protect Enable ──────┘
┌────────────────────────────────┐
│ J01 - Terminator Power Jumpers ├──────────────────┐
└────────────────────────────────┘                  │
            Terminator power from the drive.       ╓1──╖ *
              (default)                            ╙°─°╜
                                                    ° °
            Terminator power from pin 26 on the      ╓─╖
              SCSI bus.                             °║°║
                                                    °╙°╜

            Terminator to the SCSI bus on pin 26.   ╓─╖  *
                                                    ║°║°
                                                    ╙°╜°

            Terminator power to the SCSI bus and    ╓─╥─╖*
              drive.                                ║°║°║
                                                    ╙°╜°╨
            * Valid for single ended drives only.


    Note: ST-11950WD (differential model) does not come with any
          provision to use Termination resistors.  Therefore, SCSI bus
          needs to be externally terminated.


                            ST-11950W


       UNFORMATTED CAPACITY (MB) ________________2030
       FORMATTED CAPACITY (xx SECTORS) (MB) _____1690
       AVERAGE SECTORS PER TRACK ________________81 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________40,665
       CYLINDERS ________________________________2,706 user
       HEADS ______PHYSICAL______________________15
       DISCS (3.5 in) ___________________________8
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec)________34.3 to 56.5
       EXTERNAL TRANSFER RATE (mbyte/sec) _______20 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER __W/WD_____________________________1024/512 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST WIDE
       BYTES PER TRACK __________________________50,888 average
       SECTORS PER DRIVE ________________________3,291,790
       TPI (TRACKS PER INCH) ____________________3,047
       BPI (BITS PER INCH) ______________________52,187
       AVERAGE ACCESS (ms) (read/write)__________8.0/9.0
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) ___________________0.6/0.9
       MAX FULL SEEK (ms) _______________________17/19
       MTBF (power-on hours) ____________________500,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.18
                           +12V TYPICAL (amps) __0.83 idle
                           +5V START-UP (amps) __1.0
                           +5V TYPICAL (amps) ___0.76 idle
                           IDLE (watts) _________12.5
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.63/41.4
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.97/151.6
                        Weight    (lbs/kg):     2.3/1.04

Already low-level formatted at the factory with 6 spare sectors
per cylinder and 1 spare cylinders per unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product
offerings or specifications. (08/08/94)