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



ST-34520W Ultra SCSI Wide (Medalist Pro 4520W SCSI)
ST-34520LW Ultra2 SCSI Wide (Medalist Pro 4520W SCSI, LVD)

  ͻ
   REAR VIEW   (ST-34520W/LW only)
  ͼ
        (TOP)                  J5 Auxiliary
          ___________________    1/\
        ( 1)ͳ:::::: 0 0 0 0 
          \ĳ/     25GG12
       68 pin I/O Cable        
       Connection Male             SCSI ID = 0 (none)
                                 SCSI ID = 1
                   pin-11 +5v ٳ SCSI ID = 2
                   pin-10 GND ٳ SCSI ID = 4
                                   SCSI ID = 8
      pins 9 & 12 no connection    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.


  ͻ
   REAR VIEW   (ST-34520WC 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 connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin
                                2-557101-1 right angle to PCB

  ͻ
   SIDE VIEW   (ST-34520W/LW/WC/LC)
  ͼ

             FRONT    TOP (HDA)    J2  87654321              ͸
              OF PWA͵J1
             DRIVE    BOTTOM           ::::::::              ;
                                       
          Enable T-Res (W model only) Ĵ Terminator Power
 Force Single-ended (LVD models only) ٳ Terminator Powerÿ
           Start Delay (12 secs * ID) ٳ Reserved         
                          Motor Start ٳ Parity Disable   
                        Write Protect                       
                                                                 
            Ŀ                   
             Termination Power-source Table 
            Ŀ
                      ........PWA edgeͳ
                                   2 1       2 1     2 1  
             A Drive Supplies Bus   ķ     ķ           
             B Drive Supplies Own            
             C Bus Supplies Drive            
             A+B is valid           A         B       C   
            Default
            (option A only on LW models)

      Note: 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.



  ͻ
   FRONT VIEW   (ST-34520W/LW/WC/LC)
  ͼ
                                  ĴReserved. Shipped with cover installed.
                                    Do not remove. Do not install jumpers
                      TOP (HDA)  ͸     1
     PWA͵::::::::::
                 *    BOTTOM     ;123456
                                J6    
            LED                      
                            Remote LED ٳ ID 1
                           (pin-11 +5v)  ID 2
                              Reserved ٳ ID 4
                                          ID 8


     Caution:  Do not use J2 jumpers on J6.  The internal contacts
               will be bent and cannot be reused on J2 without them
               falling off.



                            ST-34520W


       UNFORMATTED CAPACITY (GB) ________________
       FORMATTED CAPACITY (GB) __________________4.55
       AVERAGE SECTORS PER TRACK ________________246 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________36,024
       CYLINDERS ________________________________9,006 user
       HEADS ______PHYSICAL______________________4
       DISCS (3.5 in) ___________________________2
       MEDIA TYPE _______________________________THIN FILM/MR
       RECORDING METHOD _________________________ZBR EPRML (16/17)
       INTERNAL TRANSFER RATE (mbits/sec)________110 to 193.88
       INTERNAL FORMATTED TRANSFER RATE (MB/sec)_14.0
       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) _______________________512 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-3 Ultra, Wide
         ASA II, S.M.A.R.T., SCAM level 2 
       BYTES PER TRACK __________________________115,078 average
       SECTORS PER DRIVE ________________________8,888,924
       TPI (TRACKS PER INCH) ____________________9570
       BPI (PEAK KBITS PER INCH) ________________179.2
       AVERAGE ACCESS (ms read/write)____________9.5/10.5
         Drive level with controller overhead
       SINGLE TRACK SEEK (ms read/write) ________2.5/3.5
       MAX FULL SEEK (ms) _______________________21.0/23.5
       MTBF (power-on hours) ____________________800,000
       SHOCK (G's):
                operating (Read/Write) __________10
                abnormal ________________________
                nonoperating 11/2 msec __________75/200
       ACOUSTICS (Bels typ/max) _________________3.9/4.2
       POWER DISSIPATION (watts/BTUs) Active ____14.1/48.1
                                      Idle ______12.3/42.0
                                      Standby ___4.1/14.0
       POWER REQUIREMENTS: +12V START-UP (amps) _2.5
                           +12V TYPICAL (amps) __0.81 idle
                           +5V START-UP (amps) __
                           +5V TYPICAL (amps) ___0.51 idle
                           IDLE (watts) _________11.0
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.007/26.9
                        Width  (inches/mm):     4.000/101.6
                        Depth  (inches/mm):     5.754/146.15
                        Weight    (lbs/kg):       1.5/0.68

Already low-level formatted at the factory with 8033 spare sectors 
per volume for both P and G lists.  

ZBR = Zone Bit Recording = Variable sectors per track

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

