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-1581N SCSI-2 Fast +===========+ # REAR VIEW # +===========+ 50 pin I/O Cable Connection #========================1# J4|:::::::::::::::::::::::::| /---------\ =#==P=W=A====================| 0 0 0 0 |== /------1 /------1 /------1 \-5-G-G-12/ \------/ \---+--/ \------/ \Terminating Resistors/ +================+ # LEFT SIDE VIEW # +================+ 12345678 #========# FRONT J6|::::::::| BACK OF ==========#1=======#======P=W=A========================== OF DRIVE |||||||| DRIVE Factory Use /||||||\ Terminator Power (see below)| Motor Start -/||||\- Terminator Power (see below)+--\ Start Delay --/||\-- Reserved | Write Protect ---/\--- Parity /---------------------+----------\ | Termination Power-source Table | +--------------------------------+--------\ | 7 8 7 8 7 8 | | #-# #-# #---# A Drive Supplies Own | | o#o# #o#o #o-o# B Drive Supplies Bus | | o#o# #o#o o o C Bus Supplies Drive | | A B C | \============P=W=A========================/ +=================+ # RIGHT SIDE VIEW # +=================+ #===# BACK J5|:::| FRONT OF =====#===#===P=W=A======================================= OF DRIVE ||| DRIVE ID 4 -/|\- ID 1 If these ID jumpers are used, ID 2 then ID jumpers shown in front view ARE NOT USED. +============+ # FRONT VIEW # +============+ If these ID jumper are used, #=====# then ID jumpers shown in right side J7|:::::| view ARE NOT USED. ==#1====#=======P=W=A===================== ||||| ID 1 /|||\ Remote LED ID 2 -/|\- Spindle Synchronization ID 4 ST - 1581N UNFORMATTED CAPACITY (MB) ________________613 FORMATTED CAPACITY (xx SECTORS) (MB) _____525 AVERAGE SECTORS PER TRACK ________________77 ACTUATOR TYPE ____________________________VOICE COIL TRACKS ___________________________________13,302 CYLINDERS ________________________________1,476 HEADS ____________________________________9 DISCS (3.5 in) ___________________________5 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) INTERNAL TRANSFER RATE (mbits/sec) _______20 to 32 SPINDLE SPEED (RPM) ______________________4,412 AVERAGE LATENCY (mSEC) ___________________6.8 BUFFER ___________________________________256 Kbyte Read Look-Ahead, Adaptive, Multi-Segmented Cache INTERFACE ________________________________SCSI-2 Fast SECTOR PER DRIVE _________________________1,022,868 TPI (TRACKS PER INCH) ____________________1760 BPI (BITS PER INCH) ______________________ AVERAGE ACCESS (ms) ______________________14 SINGLE TRACK SEEK (ms) ___________________2.5 MAX FULL SEEK (ms) _______________________26 MTBF (power-on hours) ____________________150,000 POWER REQUIREMENTS: +12V START-UP (amps) _2.5 +12V TYPICAL (amps) __0.54 +5V TYPICAL (amps) ___0.53/0.8(ND) TYPICAL (watts) ______9/11.0(ND) MAXIMUM (watts) ______15 WRITE PRECOMP (cyl) ______________________N/A REDUCED WRITE CURRENT (cyl) ______________N/A LANDING ZONE (cyl)________________________AUTO PARK IBM AT DRIVE TYPE ________________________0 or NONE Already low-level formatted at the factory. ZBR = Zone Bit Recording = Variable sectors per track Seagate reserves the right to change, without notice, product offerings or specifications. (4/12/91)