|
| |
ST-252 ST412 MFM
(same as ST-251 with Terminator that cannot be removed, therefore
drive must be installed at the end of the daisy chain 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 - 252
UNFORMATTED CAPACITY (MB) ________________51.2
FORMATTED CAPACITY (17 SECTORS) (MB) _____42.8
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________4,920
CYLINDERS ________________________________820
HEADS ____________________________________6
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________MFM
TRANSFER RATE (mbits/sec) ________________5.0
SPINDLE SPEED (RPM) ______________________3,600
INTERFACE ________________________________ST412
TPI (TRACKS PER INCH) ____________________777
BPI (BITS PER INCH) ______________________9,935
AVERAGE ACCESS (ms) ______________________40/28*
SINGLE TRACK SEEK (ms) ___________________8
MTBF (power-on hours) ____________________100,000
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 ________________________44, 40, or 3**
*ST251-0/ST251-1
**MAY REQUIRE PARTITIONING SOFTWARE
Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90) |