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 1994 ST-31250W/WC SCSI-2 Fast Wide (Barracuda 2LP) +===========+ # REAR VIEW # (ST-31250W only) +===========+ /----- ID 8 |/---- ID 4 ||/--- ID 2 |||/-- ID 1 (TOP) J5 |||| ___________________ /-- -1\/=========\ =( ×××××××××××××××××1)=|::::::|| 0 0 0 0 #= \------------|----/ \ -- /\-5-G-G-12/ 68 pin I/O Cable/ || Connection || (o o) - These pins not on || o o differential model WD Spindle Synch Cable Connector --/| o o (pin-11 SSREF, pin-12 ground) | 2 1 Remote LED Connector ------------/ | [pin-9 cathode (neg), | pin-10 anode (pos)] | | | /- J1 Terminator options -+- (single-ended) -----------\ | o o (o o) o o o o #o=o# | | o o o#o# #o#o #o=o# o o | | #o=o# o|o| |o|o |o|o| o o | | 2===1 2 \=1 2=/ 1 2=#=1 2 1 | | A B C D E | \------------------------------------------------------/ A - Term. power from drive (default) B - Term. power to SCSI bus (only option available for differential WD) C - Term. power from SCSI bus D - Term. power to SCSI bus and drive E - Enable SCSI terminator (jumper on pins 5-6) +===========+ # REAR VIEW # (ST-31250WC only) +===========+ 80 pin I/O and DC Power Wall/bracket Connection | Female J1 /----|---------------\ TOP (HDA) ==========/ ×××××××××××××××××××× \========== (\-1------------------40/) BOTTOM Notes on 80 pin I/O connector: pins 1 - 4 = +12v 41 - 44 = 12v GND 34 - 36 = +5v 74 - 76 = 5v GND 37 = SYNC 77 = LEDC 38 = MTRON 78 = DLYDST 39 = SCSIA0 79 = SCSIA1 40 = SCSIA2 80 = SCSIA3 Mating WC connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin 2-557101-1 right angle to PCB +=================+ # RIGHT SIDE VIEW # (ST-31250W/WC) +=================+ BACK #=# J2 123456789 TOP (HDA) FRONT OF I/O#======================P=W=A======================= OF DRIVE \=/ ::::::::: BOTTOM DRIVE ||||||||| 1-2 Reserved --+/||||\++-- Reserved 7-9 3 Parity Disable ----/||\----- Delay Motor Start 6 4 Write Protect -----/\------ Motor Start Enable 5 +============+ # FRONT VIEW # (ST-31250W/WC) /------- +5V +============+ |/------ Enable SCSI terminator ||/----- ID 8 |||/---- ID 4 ||||/--- ID 2 |||||/-- ID 1 (J4 top row) TOP (HDA) ||||||1 ==P=W=A=====================#::::::::::#== J4 BOTTOM |||||||||| |||||||||| (J4 bottom row) Reserved -+++/|||||| No connection -----/||||| Ground ------/|||| Unit Active LED pin (+) -------/||| SSREF (+) spindle sync --------/|| Vendor Unique ---------/| Fault LED pin (+) ----------/ ST-31250W Barracuda 2LP UNFORMATTED CAPACITY (MB) ________________1205.3 FORMATTED CAPACITY (xx SECTORS) (MB) _____1020.9 AVERAGE SECTORS PER TRACK ________________107 rounded down ACTUATOR TYPE ____________________________ROTARY VOICE COIL TRACKS ___________________________________18,555 CYLINDERS ________________________________3,711 user HEADS ______PHYSICAL______________________5 DISCS (3.5 in) ___________________________3 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) INTERNAL TRANSFER RATE (mbits/sec)________47.5 to 72.0 EXTERNAL TRANSFER RATE (mbyte/sec) _______5 Async EXTERNAL TRANSFER RATE (mbyte/sec) _______5.0 to 20 Sync SPINDLE SPEED (RPM) ______________________7,200 AVERAGE LATENCY (mSEC) ___________________4.17 BUFFER ___________________________________512 KByte Read Look-Ahead, Adaptive, Multi-Segmented Cache INTERFACE ________________________________SCSI-2 FAST Wide ASA II BYTES PER TRACK __________________________64,160 average SECTORS PER DRIVE ________________________ TPI (TRACKS PER INCH) ____________________4,048 BPI (BITS PER INCH) ______________________73,820 AVERAGE ACCESS (ms) (read/write)__________8.0/9.0 Drive level without controller overhead SINGLE TRACK SEEK (ms) ___________________0.6/0.9 MAX FULL SEEK (ms) _______________________17/19 MTBF (power-on hours) ____________________800,000 SHOCK (G's): operating (Read/Write) __________2 nonoperating ____________________50 ACOUSTICS (typ/max dBA) __________________4.7/ POWER REQUIREMENTS: +12V START-UP (amps) _1.26 +12V TYPICAL (amps) __0.88 idle +5V START-UP (amps) __0.91 +5V TYPICAL (amps) ___0.33 idle IDLE (watts) _________ LANDING ZONE (cyl) _______________________AUTO PARK IBM AT DRIVE TYPE ________________________0 or NONE Physical: Height (inches/mm): 1.00/25.4 Width (inches/mm): 4.00/101.6 Depth (inches/mm): 5.75/146.05 Weight (lbs/g): 1.2/545 Already low-level formatted at the factory with 9 spare sectors per cylinder and 1 spare cylinder per unit. ZBR = Zone Bit Recording = Variable sectors per track Seagate reserves the right to change, without notice, product offerings or specifications. (08/25/94)