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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1994



ST-32550N SCSI-2 Fast (Barracuda 2LP)

  ÉÍÍÍÍÍÍÍÍÍÍÍ»
  º REAR VIEW º  (ST-32550N/ND)
  ÈÍÍÍÍÍÍÍÍÍÍͼ

         50 pin I/O Cable Connection
         ³
      ÕÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ1¸ /ÄÄÄÄÄÄÄÄÄ\    TOP (HDA)
     ͵:::::::::::::::::::::::::Æͳ 0 0 0 0 ³ÍÍ
      ÔÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ; ÀÄ5ÄGÄGÄ12Ù    BOTTOM

  These pins not on differential --> (o o)  back
   model ND                 ÚÄÄÄÄÄÄ   o o  
                            ³         o o   front
                            ³        2   1
                            ³
  ÚÄ J1 Terminator options ÄÁÄ (single-ended) ÄÄÄÄÄÄÄÄÄÄÄ¿
  ³      o o       o o       o o       o o      ÕoÍo¸    ³
  ³      o o       oÕo¸     Õo¸o      ÕoÑo¸      o o     ³
  ³     ÕoÍo¸      o³o³     ³o³o      ³o³o³      o o     ³
  ³     2ÍÍÍ1     2 ÔÍ1     2; 1     2ÍÏÍ1     2   1    ³
  ³      A         B         C         D         E       ³
  ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
     A - Term. power from drive (default)
     B - Term. power to SCSI bus (only option available for differential ND)
     C - Term. power from SCSI bus
     D - Term. power to SCSI bus and drive
     E - Enable SCSI terminator (jumper on pins 5-6)


  ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
  º RIGHT SIDE VIEW º  (ST-32550N)
  ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ


BACK   Õ͸       J2  123456789                   TOP (HDA)  FRONT
 OF   I/OÆÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍPÍWÍAÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ OF
DRIVE  Ô;           :::::::::                   BOTTOM     DRIVE
                     ³³³³³³³³³
      1-2 Reserved ÄÄÁÙ³³³³ÀÁÁÄÄ Reserved 7-9
  3 Parity Disable ÄÄÄÄÙ³³ÀÄÄÄÄÄ Delay Motor Start 6
   4 Write Protect ÄÄÄÄÄÙÀÄÄÄÄÄÄ Motor Start Enable 5



  ÉÍÍÍÍÍÍÍÍÍÍÍÍ»
  º FRONT VIEW º  (ST-32550N)
  ÈÍÍÍÍÍÍÍÍÍÍÍͼ

                                     J4
                      TOP (HDA)             1
     ÍÍPÍWÍAÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͵::::::::::ÆÍÍ
                      BOTTOM      ³³³³³³³³³³
                                  ³³³³³³³³³³
                        Reserved ÄÁÁÁÙ³³³³³ÀÄ Reserved
                            ID 4 ÄÄÄÄÄÙ³³³ÀÄÄ Remote LED (pin-3 +5v)
                            ID 2 ÄÄÄÄÄÄÙ³ÀÄÄÄ Spindle Synchronization
                            ID 1 ÄÄÄÄÄÄÄÙ      (pin-6 REF SIG+)



                            ST-32550N
                            Barracuda 2LP

       UNFORMATTED CAPACITY (MB) ________________2541.3
       FORMATTED CAPACITY (xx SECTORS) (MB) _____2147.4
       AVERAGE SECTORS PER TRACK ________________108 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________38,610
       CYLINDERS ________________________________3,510 user
       HEADS ______PHYSICAL______________________11
       DISCS (3.5 in) ___________________________6
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec)________49.4 to 72.0
       EXTERNAL TRANSFER RATE (mbyte/sec) _______5 Async
       EXTERNAL TRANSFER RATE (mbyte/sec) _______2.5 to 10 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER ___________________________________512 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST
                                                 ASA II
       BYTES PER TRACK __________________________64,160 average
       SECTORS PER DRIVE ________________________
       TPI (TRACKS PER INCH) ____________________4,048
       BPI (BITS PER INCH) ______________________72,680
       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) ____________________800,000
       SHOCK (G's):
                operating (Read/Write) __________2
                nonoperating ____________________50
       ACOUSTICS (typ/max dBA) __________________4.7/
       POWER DISSIPATION (watts/BTUs) Active ____11/35
                                      Idle ______9/31
       POWER REQUIREMENTS: +12V START-UP (amps) _1.26
                           +12V TYPICAL (amps) __0.88 idle
                           +5V START-UP (amps) __0.91
                           +5V TYPICAL (amps) ___0.33 idle
                           IDLE (watts) _________
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.00/25.4
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.75/146.05
                        Weight     (lbs/g):     1.2/545

Already low-level formatted at the factory with 9 spare sectors
per cylinder and 1 spare cylinder per unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product 
offerings or specifications. (05/20/96)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/scsi/st32550n.txt.