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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-278R ST412 RLL
(same as ST-277R with Terminator that cannot be removed, therefore
drive must be installed at the end of the daisychain cable.)
/?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??- cannot be removed
? ? ? ? ? ? ? ?
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 - 278R
UNFORMATTED CAPACITY (MB) ________________76.9
FORMATTED CAPACITY (26 SECTORS) (MB) _____65.5
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________4,920
CYLINDERS ________________________________820
HEADS ____________________________________6
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL
TRANSFER RATE (mbits/sec) ________________7.5
SPINDLE SPEED (RPM) ______________________3,600
INTERFACE ________________________________ST412
TPI (TRACKS PER INCH) ____________________777
BPI (BITS PER INCH) ______________________14,902
AVERAGE ACCESS (ms)*______________________40/28
SINGLE TRACK SEEK (ms) ___________________8
MTBF (power-on hours) ____________________70,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0/2.5*
+12V TYPICAL (amps) __0.5
+5V TYPICAL (amps) ___1.0/1.2*
TYPICAL (watts) ______11/12*
MAXIMUM (watts) ______29/36*
BUFFERED STEP PULSE RATE (micro sec) _____3-200
WRITE PRECOMP (cyl) ______________________N/A (821)
REDUCED WRITE CURRENT (cyl) ______________N/A (821)
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE _______________________**
*ST277R-0/ST277R-1
* MAY REQUIRE A CONTROLLER WITH BIOS SUPPORT, OR FORMATTING
AND PARTITIONING SOFTWARE. ALSO, CHECK TO SEE IF YOUR CMOS SETUP
HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE AVAILABLE.
Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)