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                            (C)opyright 1991



ST-12551N SCSI-2 Fast Wide (Barracuda 2)


                            ST-12550N


       UNFORMATTED CAPACITY (MB) ________________2547
       FORMATTED CAPACITY (xx SECTORS) (MB) _____2100
       AVERAGE SECTORS PER TRACK ________________78 rounded down
       ACTUATOR TYPE ____________________________STRAIGHT ARM
       TRACKS ___________________________________52,364
       CYLINDERS __PHYSICAL______________________2,756
       HEADS ______PHYSICAL______________________19
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       TRANSFER RATE INTERNAL (mbits/sec)________36 to 56
       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
       BYTES PER TRACK __________________________36,750 TO 58,800
       SECTORS PER DRIVE ________________________4,101,563
       TPI (TRACKS PER INCH) ____________________
       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) _______________________20.0/21.0
       MTBF (power-on hours) ____________________500,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.5
                           +12V TYPICAL (amps) __0.7
                           +5V START-UP (amps) __
                           +5V TYPICAL (amps) ___0.7
                           TYPICAL (watts) ______12
                           MAXIMUM (watts) ______
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       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):     5.97/146.1
                        Weight    (lbs/kg):     1.8/0.80

Already low-level formatted at the factory with one spare sector
per track and two spare cylinders/unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product
offerings or specifications. (12/08/92)
