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



ST-118273N Ultra-SCSI (Barracuda 18)

  ÉÍÍÍÍÍÍÍÍÍÍÍ»
  º REAR VIEW º  (ST-118273N)
  ÈÍÍÍÍÍÍÍÍÍÍͼ

         50 pin I/O Cable Connection
         ³
    J1ÕÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ1¸ /ÄÄÄÄÄÄÄÄÄ\    TOP (HDA)
     ͵:::::::::::::::::::::::::Æͳ 0 0 0 0 ³ÍÍ
      ÔÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ; ÀÄ5ÄGÄGÄ12Ù    BOTTOM



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  º SIDE VIEW º  (ST-118273N)
  ÈÍÍÍÍÍÍÍÍÍÍͼ

    FRONT    TOP (HDA)    J2  87654321              Õ͸
     OF ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍPÍWÍAÍÍÍÍÍ͵J1 Cable
    DRIVE    BOTTOM           ::::::::              Ô;
                              ³³³³³³³³
  Enable T-Res (N model only) Ù³³³³³³À Terminator Power³
   Start Delay (12 secs * ID) ÄÙ³³³³ÀÄ Terminator Powerÿ
                  Motor Start ÄÄÙ³³ÀÄÄ Reserved         ³
                Write Protect ÄÄÄÙÀÄÄÄ Parity Disable   ³
                                                        ³
    ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿                  ³
    ³ Termination Power-source Table ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
    ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
    ³          ÍÍÍÍÍ....ÍÍÍÍÍ....ÍÍÍÍÍPWA edgeÍÍÍÍͳ
    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
    ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄDefaultÄÄÄÄÄÄÄÄÄÙ
    Note: ND drives do not have internal terminators or any other
          way of adding internal terminators to the drive; use
          external active termination if required.


  ÉÍÍÍÍÍÍÍÍÍÍÍÍ»
  º FRONT VIEW º  (ST-118273N)
  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)  ³
                            Reserved ÄÄÙ


                            ST-118273N


       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) _______20 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER (/optional)________________________512/2048 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________Ultra-SCSI
                 ASA II, SCAM level 2
       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. (04/14/98)

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