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ST-225R 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 - 225R
UNFORMATTED CAPACITY (MB) ________________25.0
FORMATTED CAPACITY (31 SECTORS) (MB) _____21.2
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________1,334
CYLINDERS ________________________________667
HEADS ____________________________________2
DISCS ____________________________________1
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 ________________________*
*MUST BE USED WITH THE ST11R CONTROLLER OR
16-BIT CONTROLLER
* 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) |