ST - 250R

       UNFORMATTED CAPACITY (MB) ________________50.0
       FORMATTED CAPACITY (31 SECTORS) (MB) _____42.3
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________2,668
       CYLINDERS ________________________________667
       HEADS ____________________________________4
       DISCS ____________________________________2
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________RLL
       TRANSFER RATE (mbits/sec) ________________7.5
       INTERFACE ________________________________ST412
       TPI (TRACKS PER INCH) ____________________588
       BPI (BITS PER INCH) ______________________18,897
       AVERAGE ACCESS (ms) ______________________70
       SINGLE TRACK SEEK (ms) ___________________20
       MTBF (power-on hours) ____________________50,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.4
                           +12V TYPICAL (amps) __0.9
                           +5V TYPICAL (amps) ___1.1
                           TYPICAL (watts) ______16.3
                           MAXIMUM (watts) ______35
       BUFFERED STEP PULSE RATE (micro sec) _____5-200
       WRITE PRECOMP (cyl) ______________________N/A (668)
       REDUCED WRITE CURRENT (cyl) ______________N/A (668)
       LANDING ZONE (cyl)________________________670
       IBM AT DRIVE TYPE ________________________N/A*

       *MUST BE USED WITH THE ST11R CONTROLLER; MAY REQUIRE
        PARTITIONING SOFTWARE