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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-125 ST412 MFM
/????
? O ?12
? O ?G
? O ?G
? O ?5
?Data Cable ?Controller Cable 1 \????
????????? ?? ???????????????????? ??? ????????????
1 o o o o o o o ?????????????1
o o o o o o o o ??????????????
? ? ? ? 4 3 2 1 ? Resistor Termination Pack
? ? ? ? ???????
? ? ? ? ?
? ? ? ? ????? Drive Selects
? ? ? ?????????? Factory Test
? ? ???????????? Write Fault
? ?????????????? Not Used
???????????????? Radial
Note: Some configurations have the drive select jumper block oriented
perpendicular to the back of the drive. In this configuration,
pin-1 (radial select) is closest to the front faceplate of the
drive.
ST - 125
UNFORMATTED CAPACITY (MB) ________________25.6
FORMATTED CAPACITY (17 SECTORS) (MB) _____21.4
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________2,460
CYLINDERS ________________________________615
HEADS ____________________________________4
DISCS ____________________________________2
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________MFM
TRANSFER RATE (mbits/sec) ________________5.0
SPINDLE SPEED (RPM) ______________________3,600
AVERAGE LATENCY (mSEC) ___________________8.3
INTERFACE ________________________________ST412
SECTORS PER DRIVE ________________________41,820
TPI (TRACKS PER INCH) ____________________824
BPI (BITS PER INCH) ______________________14,953
AVERAGE ACCESS (ms)*______________________40/28
SINGLE TRACK SEEK (ms) ___________________8
MAX FULL SEEK (ms) _______________________70
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0
+12V TYPICAL (amps) __0.35
+5V TYPICAL (amps) ___0.8
TYPICAL (watts) ______8
MAXIMUM (watts) ______28
BUFFERED STEP PULSE RATE (micro sec) _____3-200
WRITE PRECOMP (cyl) ______________________N/A (616)
REDUCED WRITE CURRENT (cyl) ______________N/A (616)
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE ________________________6
*ST125-0/ST125-1
Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)