                         SEAGATE TECHNOLOGY, INC.
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Ŀ
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                            (C)opyright 1994



ST-32550W/WC SCSI-2 Fast Wide (Barracuda 2LP)

ͻ
 REAR VIEW   (ST-32550W only)
ͼ
                                          ID 8
                                          ID 4
                                          ID 2
                                          ID 1
               (TOP)                  J5 
                 ___________________    1/\
               ( 1)ͳ:::::: 0 0 0 0 
                 \ĳ/      5GG12
              68 pin I/O Cable        
              Connection                       (o o) - These pins not on
                                                o o    differential model WD
       Spindle Synch Cable Connector ٳ         o o
         (pin-11 SSREF, pin-12 ground)          2   1
       Remote LED Connector         
        [pin-9 cathode (neg),                    
         pin-10 anode (pos)]                     
                                                 
                                                 
                        J1 Terminator options  (single-ended) Ŀ
                             o o      (o o)      o o       o o      oo    
                             o o       oo     oo      oo      o o     
                            oo      oo     oo      oo      o o     
                            21     2 1     2; 1     21     2   1    
                             A         B         C         D         E       
                       
                         A - Term. power from drive (default)
                         B - Term. power to SCSI bus (only option available for
                              differential WD)
                         C - Term. power from SCSI bus
                         D - Term. power to SCSI bus and drive
                         E - Enable SCSI terminator (jumper on pins 5-6)


  ͻ
   REAR VIEW   (ST-32550WC only)
  ͼ
                     80 pin I/O and DC Power Wall/bracket Connection
                       Female
    J1          /ĳ\      TOP (HDA)
     /  \
              (\140/)    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 WC connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin
                                   2-557101-1 right angle to PCB


  ͻ
   RIGHT SIDE VIEW   (ST-32550W/WC)
  ͼ


BACK   ͸       J2  123456789                   TOP (HDA)  FRONT
 OF   I/OPWA OF
DRIVE  ;           :::::::::                   BOTTOM     DRIVE
                     
      1-2 Reserved ٳ Reserved 7-9
  3 Parity Disable ٳ Delay Motor Start 6
   4 Write Protect  Motor Start Enable 5



  ͻ
   FRONT VIEW   (ST-32550W/WC)       +5V
  ͼ                       Enable SCSI terminator
                                       ID 8
                                       ID 4
                                       ID 2
                                       ID 1   (J4 top row)
                      TOP (HDA)       1
     PWA͵::::::::::  J4
                      BOTTOM      
                                            (J4 bottom row)
                        Reserved ٳ
                   No connection ٳ
                          Ground ٳ
         Unit Active LED pin (+) ٳ
          SSREF (+) spindle sync ٳ
                   Vendor Unique ٳ
               Fault LED pin (+) 



                            ST-32550W
                            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) _______5.0 to 20 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 Wide
                                                 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 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. (08/25/94)
