                         SEAGATE TECHNOLOGY, INC.
       Customer Technical Support FAX Network +1 408 438-8137
     Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
Ŀ
 United States    +1 408 438-8771   United Kingdom +44 628 478011  
Ĵ
 Germany         +49  89 140-9331   Singapore      +65   227-2217  

                            (C)opyright 1993



ST-12450W SCSI-2 Fast Wide (Barracuda 2, 2HP)
2HP = 2 Head Parallel = two read write channels at once

                                        J01Ŀ
                                       (see    1
ͻ                           below) 
 REAR VIEW                                   1Ŀ J4-1Ŀ
ͼ                                  "                 |
                                               "J4 1-6           
                                               "(see below)      |
                                               "J4-6Ŀ         
        (TOP)                    J5            "-J4-8 |         |
          ___________________    1/\     | |         |
        ( 1)ͳ:::::: 0 0 0 0               
          \ĳ/      5GG12               1
       68 pin I/O Cable                         : : : : : : :
       Connection                                      2
                                  Reserved       
Spindle Synch Cable Connector ٳ   (J4-7 and J4-8       
  (pin-11 SSREF, pin-12 ground)      are reserved)       
Remote LED Connector ٳ                        
 [pin-9 cathode (neg),              Enable Drive      
  pin-10 anode (pos)]                Terminators           
                                    Reserved     
SCSI ID = 8 ٳ   (default OFF)          
SCSI ID = 4 ٳ  Parity Disable    
SCSI ID = 2 ٳ  Enable Motor Start   
SCSI ID = 1   Delay Motor Start  
SCSI ID = 0 (none)                       (10 sec * ID)             
                                        Write Protect Enable 
Ŀ
 J01 - Terminator Power Jumpers Ŀ
                  
            Terminator power from the drive.       1ķ *
              (default)                            
                                                     
            Terminator power from pin 26 on the      ķ
              SCSI bus.                             
                                                    

            Terminator to the SCSI bus on pin 26.   ķ  *
                                                    
                                                    

            Terminator power to the SCSI bus and    ķ*
              drive.                                
                                                    
            * Valid for single ended drives only.


    Note: ST-12450WD (differential model) does not come with any
          provision to use Termination resistors.  Therefore, SCSI bus
          needs to be externally terminated.


                            ST-12450W


       UNFORMATTED CAPACITY (MB) ________________2437
       FORMATTED CAPACITY (xx SECTORS) (MB) _____1849
           Standard OEM model formatted to 512
           bytes/block
       AVERAGE SECTORS PER TRACK ________________149 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________48,726
       CYLINDERS ________________________________2,710 user
       HEADS ______PHYSICAL/LOGICAL______________18/9
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec):
         Per Logical Head _______________________68.6 to 113.0
         Per Physical Head ______________________34.3 to 56.5
       EXTERNAL TRANSFER RATE (mbyte/sec) _______20 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER ___________________________________1024 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST WIDE
                                                 ASA
       BYTES PER TRACK __________________________99,536 average
       SECTORS PER DRIVE ________________________3,957,500
       TPI (TRACKS PER INCH) ____________________3,047
       BPI (BITS PER INCH) ______________________52,187
       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) ____________________500,000
       SHOCK (G's):
                operating (Read/Write) __________2
                nonoperating ____________________50
       ACOUSTICS (typ/max dBA) __________________4.7/
       POWER REQUIREMENTS: +12V START-UP (amps) _2.18
                           +12V TYPICAL (amps) __0.83 idle
                           +5V START-UP (amps) __1.0
                           +5V TYPICAL (amps) ___0.76 idle
                           IDLE (watts) _________13.5
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.63/41.4
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.97/151.6
                        Weight    (lbs/kg):     2.3/1.04

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. (08/26/94)

