SEAGATE TECHNOLOGY, INC. Customer Technical Support FAX Network +1 408 438-8137 Customer Technical Support Bulletin Boards (300-9600, 8-N-1) ��������������������������������������������������������������������Ŀ � United States +1 408 438-8771 � United Kingdom +44 628 478011 � ��������������������������������������������������������������������Ĵ � Germany +49 89 140-9331 � Singapore +65 227-2217 � ���������������������������������������������������������������������� (C)opyright 1994 ST-31250W/WC SCSI-2 Fast Wide (Barracuda 2LP) �����������ͻ � REAR VIEW � (ST-31250W only) �����������ͼ ������ ID 8 ������ ID 4 ������ ID 2 ������ ID 1 (TOP) J5 ���� ___________________ ��� �1�/���������\ �( �����������������1)ͳ::::::�� 0 0 0 0 �� \�����������ij����/ � �� ���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 ��ٳ 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) ����������Ŀ � 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) �����������ͻ � REAR VIEW � (ST-31250WC only) �����������ͼ 80 pin I/O and DC Power Wall/bracket Connection � Female J1 /���ij���������������\ 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 �����������������ͻ � RIGHT SIDE VIEW � (ST-31250W/WC) �����������������ͼ BACK �͸ J2 123456789 TOP (HDA) FRONT OF I/O�����������������������P�W�A����������������������� OF DRIVE �; ::::::::: BOTTOM DRIVE ��������� 1-2 Reserved ���ٳ�������� Reserved 7-9 3 Parity Disable ����ٳ������� Delay Motor Start 6 4 Write Protect ������������� Motor Start Enable 5 ������������ͻ � FRONT VIEW � (ST-31250W/WC) �������� +5V ������������ͼ �������� 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 ����ٳ����� No connection �����ٳ���� Ground ������ٳ��� Unit Active LED pin (+) �������ٳ�� SSREF (+) spindle sync ��������ٳ� Vendor Unique ���������ٳ 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 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)