SEAGATE TECHNOLOGY, INC. Customer Technical Support FAX Network +1 408 438-8137 Customer Technical Support Bulletin Boards (300-9600, 8-N-1) /----------------------------------+---------------------------------\ | United States +1 408 438-8771 | United Kingdom +44 628 478011 | +----------------------------------+---------------------------------| | Germany +49 89 140-9331 | Singapore +65 227-2217 | \----------------------------------+---------------------------------/ (C)opyright 1991 ST-252 ST412 MFM (same as ST-251 with Terminator that cannot be removed, therfore 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 - 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)