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SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
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? United States +1 408 438-8771 ? United Kingdom +44 628 478011 ?
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? Germany +49 89 140-9331 ? Singapore +65 227-2217 ?
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(C)opyright 1991
ST-250R ST412 RLL
/?4?3?2?1?\
? O O O O ? Power
o o o o o o o o ???????????
?Data Cable o o o o o o o o ?Controller Cable 1 5 G G 12
????????? ?? ? ? ? ? ? ? ? ? ???????????????????? ??? ????????????
? ? ? ? ? ? ? ? ?????????????1
? ? ? ? ? ? ? ? ??Terminator??
? ? ? ? ? ? ? ?
Drive Select->1 2 3 4 ? ? ? ? Radial
? ? ? ? ? ??? Reserved
? ??? ? ????? Write Fault
? ? ??????? Factory Test
? ?????????? Never Used (Drive Select 3 and 4)
? If twisted cable, use Drive Select 2
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
SPINDLE SPEED (RPM) ______________________3,000
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) ____________________100,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.4
+12V TYPICAL (amps) __0.9
+5V TYPICAL (amps) ___0.8
TYPICAL (watts) ______14.8
MAXIMUM (watts) ______33
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 OR 16-BIT
CONTROLLER; MAY REQUIRE PARTITIONING SOFTWARE
Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)