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 1993 ST-1950N SCSI-2 Fast +===========+ # REAR VIEW # +===========+ 50 pin I/O Cable Connection | J1#========================1# /---------\ TOP (HDA) =#:::::::::::::::::::::::::#=| 0 0 0 0 |== \=========================/ \-5-G-G-12/ BOTTOM 1------\ 1------\ 1------\ \------/ \---+--/ \------/ \Terminating Resistors/ +=================+ # RIGHT SIDE VIEW # +=================+ BACK #=# J2 12345678 TOP (HDA) FRONT OF J1#======================P=W=A======================= OF DRIVE \=/ :::::::: BOTTOM DRIVE |||||||| |Terminator Power /||||||\ Reserved /|Terminator Power -/||||\- Start Delay (12 secs * ID) | Factory Use --/||\-- Motor Start | Parity Enable ---/\--- Write Protect | | | /--------------------------------\ \-| Termination Power-source Table | +--------------------------------+-------------\ |=====....=====....=====PWA edge===== | | | | 1 2 1 2 1 2 | | #-# #-# #---# A Drive Supplies Bus | | #o#o o#o# #o-o# B Drive Supplies Own | | #o#o o#o# o o C Bus Supplies Drive | | A B C | \---------Default------------------------------/ +================+ # LEFT SIDE VIEW # +================+ If these ID jumpers are used, then ID jumpers shown in front view ARE NOT USED. FRONT TOP (HDA) J5 #==1# #=#BACK OF ========P=W=A===============================#:::#=#J1 OF DRIVE BOTTOM \===/ \=/DRIVE ||| Note: On early drives | ID 1 -/|\- ID 4 with PCB# 75782395 or | ID 2 #75782485 ID jumpers are+-- ID 4 ID 1 reversed. | +============+ # FRONT VIEW # +============+ TOP (HDA) J6 #=====1# ==P=W=A==========================#::::::#= * BOTTOM \======/ | 123456 LED -/ |||||| ID 4 /||||\ Reserved ID 2 -/||\- Remote LED (pin-3 +5v) ID 1 --/\-- Spindle Synchronization (pin-6 REF SIG+) If these ID jumper are used, then ID jumpers shown in left side view ARE NOT USED. ST - 1950N UNFORMATTED CAPACITY (MB) ________________953 FORMATTED CAPACITY (xx SECTORS) (MB) _____803 AVERAGE SECTORS PER TRACK ________________76 ACTUATOR TYPE ____________________________VOICE COIL TRACKS ___________________________________20,475 CYLINDERS ________________________________1,575 (user) HEADS ____________________________________13 DISCS (3.5 in) ___________________________7 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) INTERNAL TRANSFER RATE (mbits/sec) _______25.2 to 41.2 EXTERNAL TRANSFER RATE (mbyte/sec) _______4 Async EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync SPINDLE SPEED (RPM) ______________________4,535 AVERAGE LATENCY (mSEC) ___________________6.61 BUFFER ___________________________________256 Kbyte Read Look-Ahead, Adaptive, Multi-Segmented Cache INTERFACE ________________________________SCSI-2 Fast BYTES PER TRACK __________________________46,550 avg. TPI (TRACKS PER INCH) ____________________2,150 AVERAGE ACCESS (ms) (read/write)__________TBD Drive level without controller overhead SINGLE TRACK SEEK (ms) ___________________TBD MAX FULL SEEK (ms) _______________________TBD MTBF (power-on hours) ____________________200,000 POWER REQUIREMENTS: +12V START-UP (amps) _2.0 +12V TYPICAL (amps) __0.5 +5V TYPICAL (amps) ___0.4 TYPICAL (watts) ______11 IDLE (watts) _________9 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 Formatted at the factory with 1 spare sector per track and two spare cylinders at inner tracks per unit. Seagate reserves the right to change, without notice, product offerings or specifications. (10/12/93)