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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1997


ST-118273W Ultra SCSI Wide (Barracuda 18)
ST-118273LW Ultra2 SCSI Wide (Barracuda 18, LVD)

  ÉÍÍÍÍÍÍÍÍÍÍÍ»
  º REAR VIEW º  (ST-118273W/LW/WD only)
  ÈÍÍÍÍÍÍÍÍÍÍͼ
        (TOP)                  J5 Auxiliary
          ___________________  ÚÄÄ  Ä1¿/ÍÍÍÍÍÍÍÍÍ\
        Í( ×××××××××××××××××1)ͳ::::::³³ 0 0 0 0 ÆÍ
          \ÄÄÄÄÄÄÄÄÄÄÄijÄÄÄÄ/  À  ÄÄ 2ÙÀÄ5ÄGÄGÄ12Ù
       68 pin I/O CableÙ        ³³³³³³
       Connection Male          ³³³³³³   SCSI ID = 0 (none)
                                ³³³³³ÀÄÄ SCSI ID = 1
                   pin-11 +5v ÄÄÙ³³³ÀÄÄÄ SCSI ID = 2
                   pin-10 GND ÄÄÄÙ³ÀÄÄÄÄ SCSI ID = 4
                                  ÃÄÄÄÄÄ SCSI ID = 8
      pins 9 & 12 no connection   ÀÄÄÄÄÄÄ or pin-8 Activity LED*

* These pins are driven low for 250ms after PWR ON and RESET
  to allow jumper selectable SCSI ID as shown above.


  ÉÍÍÍÍÍÍÍÍÍÍÍ»
  º REAR VIEW º  (ST-118273WC/DC only)
  ÈÍÍÍÍÍÍÍÍÍÍͼ
                     80 pin I/O and DC Power Wall/bracket Connection
                     ³  Female
    J1          /ÄÄÄijÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ\      TOP (HDA)
     ÍÍÍÍÍÍÍÍÍÍ/ ×××××××××××××××××××× \ÍÍÍÍÍÍÍÍÍÍ
              (\Ä1ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ40/)    BOTTOM

     Notes on 80 pin I/O connector:
       pins  1 -  4 = +12v        41 - 44 = 12v GND
            34 - 36 = +5v         74 - 76 = 5v GND
                 37 = SYNC             77 = LEDC
                 38 = MTRON            78 = DLYDST
                 39 = SCSIA0           79 = SCSIA1
                 40 = SCSIA2           80 = SCSIA3

  Mating connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin
                                2-557101-1 right angle to PCB


  ÉÍÍÍÍÍÍÍÍÍÍÍ»
  º SIDE VIEW º  (ST-118273W/WD/LW/WC/DC/LC)
  ÈÍÍÍÍÍÍÍÍÍÍͼ

    FRONT    TOP (HDA)    J2  87654321              Õ͸
     OF ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍPÍWÍAÍÍÍÍÍ͵J1 Cable
    DRIVE    BOTTOM           ::::::::              Ô;
                              ³³³³³³³³
 Enable T-Res (W model only) Ä´³³³³³³ÀÄ Terminator Power³
 Force Single-ended (LC, LW, ÄÙ³³³³³ÀÄÄ Terminator Powerÿ
  LVD models only)             ³³³³ÀÄÄÄ Reserved         ³
  Start Delay (12 secs * ID) ÄÄÙ³³ÀÄÄÄÄ Parity Disable   ³
                 Motor Start ÄÄÄÙÀÄÄÄÄÄ Write Protect    ³
    ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿                   ³
    ³ Termination Power-source Table ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
    ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
    ³            ÍÍÍÍÍ....ÍÍÍÍÍ....ÍÍÍÍPWA edgeÍÍÍÍÍÍ ³
    ³                         2 1      2 1     2 1    ³
    ³ A Drive Supplies Bus     ÖÄ·    ÖÄ·             ³
    ³ B Drive Supplies Own    øºøº    ºøºø    ÖøÄø·   ³
    ³ C Bus Supplies Drive    øÓø½    Óø½ø    ÓøÄø½   ³
    ³ A+B is valid             A        B       C     ³
    ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄDefaultÄÄÄÄÄÄÄÄÄÄÙ
     (option A only on WD, or LW models)

    Note: WD, DC, LW and LC drives do not have internal terminators
          or any other way of adding internal terminators to the
          drive; use external active termination if required.
          Use active (ANSI SCSI-2 Alternative 2) terminators
          when terminating the bus.  Use active negation
          terminators when terminating a SCSI Ultra2 bus
          operating in Low Voltage Differential (LVD) mode.



  ÉÍÍÍÍÍÍÍÍÍÍÍÍ»
  º FRONT VIEW º  (ST-118273W/WD/LW/WC/DC/LC)
  ÈÍÍÍÍÍÍÍÍÍÍÍͼ
                                ÚÄÄ´Reserved. Shipped with cover installed.
                                ³  ÀDo not remove. Do not install jumpers.
                    TOP (HDA)  ÕØÍÍ͸     1
   ÍÍPÍWÍAÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͵::::³::::::ÆÍÍ
               *    BOTTOM     ÔÍÍÍ;³³³³³2
               ³               J6    ³³³³³³
          LED ÄÙ                     ³³³³³³
                          Remote LED Ù³³³³À ID 1
                         (pin-11 +5v) ³³³ÀÄ ID 2
                            Reserved ÄÙ³ÀÄÄ ID 4
                      (pin-10 ground)  ÀÄÄÄ ID 8


                            ST-118273W


       UNFORMATTED CAPACITY (GB) ________________
       FORMATTED CAPACITY (GB) __________________18.21
       AVERAGE SECTORS PER TRACK ________________237 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________150,020
       CYLINDERS ________________________________7,501 user
       HEADS ______PHYSICAL______________________20
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM/MR
       RECORDING METHOD _________________________EPR4 16/17
       INTERNAL TRANSFER RATE (mbits/sec)________120 to 190
       EXTERNAL TRANSFER RATE (mbyte/sec) _______40 Sync
            Low Voltage Differential(LVD) _______80 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER (/optional) _______________________512KB/2MB
              (LVD models /optional) ____________1MB/4MB
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________Ultra-SCSI Wide
              Low Voltage Differential __________Ultra2-SCSI Wide
              ASA II, SCAM level 2 (1 default)
       BYTES PER TRACK (avg unformatted) ________155,000
       SECTORS PER DRIVE ________________________35,566,480
       TPI (TRACKS PER INCH) ____________________8250
       BPI (KBITS PER INCH) _____________________180
       AVERAGE ACCESS (ms read/write)____________7.9/8.7
         Drive level with controller overhead
       SINGLE TRACK SEEK (ms read/write) ________1.1/1.4
       MAX FULL SEEK (ms read/write) ____________16/18
       MTBF (power-on hours) ____________________1,000,000
       SHOCK (G's, 11/2 ms):
                operating (Read/Write) __________5
                abnormal ________________________10
                nonoperating ____________________50/135
       ACOUSTICS (Bels typical, sound power) ____4.2
       POWER DISSIPATION (watts/BTUs) Active ____20.85/71.2
                                      Idle ______13.35/45.6
       POWER REQUIREMENTS: +12V START-UP (amps) _2.8
                           +12V TYPICAL (amps) __0.8 idle
                           +5V START-UP (amps) __1.2
                           +5V TYPICAL (amps) ___0.75 idle
                           IDLE (watts) _________13
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.62/41.1
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.75/146.1
                        Weight    (lbs/kg):      2.2/0.99

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

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product 
offerings or specifications. (01/14/99)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/scsi/ST118273.W.