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 1991 ST-11950N SCSI-2 Fast (Barracuda 1) �����������ͻ J01����Ŀ 1Ŀ �������J4-1�������������Ŀ � REAR VIEW � (see 1�� �"� � �����������ͼ below) ��� �"� � �"�J4 1-11 � Terminating ResistorsĿ �"�(see detail below) � ������Ŀ ����ijĿ �"� � (TOP) �������1 �������1 �"��J4-11� � ���������������������������/���������\ � � ͵::::::::::::::::::::::::1Ƴ 0 0 0 0 �� � � ����������������������ͳ�����5�G�G�12� � 5 1 50 pin I/O Cable Connection�� : : : : : : : : : : : � � � � � � � � 6 � 2 SCSI ID = 0 (none) � � � � � � � � � � � SCSI ID = 4 �������� � � � � � � � � � � SCSI ID = 2 ���������� � � � � � � � � � SCSI ID = 1 ������������ � � � � � � � � Reserved (default OFF) ��������� � � � � � � � Parity Disable ������������������� � � � � � � Enable Motor Start ����������������� � � � � � Delay Motor Start (10 sec * ID) ������ � � � � Write Protect Enable ������������������� � � � Remote LED Connector ��������������������� � � [pin-5 cathode (neg), pin-6 anode (pos)] � � Reserved (default OFF) ��������������������� � Spindle Synch Cable Connector ���������������� (pin-1 SSREF, pin-2 ground) ��������������������������������Ŀ � J01 - Terminator Power Jumpers ������������������Ŀ ���������������������������������� � Terminator power from the drive. �1�ķ (default) ����� � � Terminator power from pin 26 on the �ķ SCSI bus. ���� ���� Terminator to the SCSI bus on pin 26. �ķ ���� ���� Terminator power to the SCSI bus and ���ķ drive. ����� ����� Note: ST-11950ND (differential model) does not come with any provision to use Termination resistors. Therefore, SCSI bus needs to be externally terminated. ST-11950N UNFORMATTED CAPACITY (MB) ________________2030 FORMATTED CAPACITY (xx SECTORS) (MB) _____1689 AVERAGE SECTORS PER TRACK ________________81 rounded down ACTUATOR TYPE ____________________________ROTARY VOICE COIL TRACKS ___________________________________40,665 CYLINDERS ________________________________2,706 user HEADS ______PHYSICAL______________________15 DISCS (3.5 in) ___________________________8 MEDIA TYPE _______________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) INTERNAL TRANSFER RATE (mbits/sec)________34.3 to 56.5 EXTERNAL TRANSFER RATE (mbyte/sec) _______5 Async EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync SPINDLE SPEED (RPM) ______________________7,200 AVERAGE LATENCY (mSEC) ___________________4.17 BUFFER ___________________________________1024 KByte Read Look-Ahead, Adaptive, Multi-Segmented Cache INTERFACE ________________________________SCSI-2 FAST BYTES PER TRACK __________________________50,888 average SECTORS PER DRIVE ________________________3,291,790 TPI (TRACKS PER INCH) ____________________3,047 BPI (BITS PER INCH) ______________________52,187 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) ____________________500,000 POWER REQUIREMENTS: +12V START-UP (amps) _2.18 +12V TYPICAL (amps) __0.83 idle +5V START-UP (amps) __1.0 +5V TYPICAL (amps) ___0.76 idle IDLE (watts) _________12.5 LANDING ZONE (cyl) _______________________AUTO PARK IBM AT DRIVE TYPE ________________________0 or NONE Physical: Height (inches/mm): 1.63/41.4 Width (inches/mm): 4.00/101.6 Depth (inches/mm): 5.97/151.6 Weight (lbs/kg): 2.3/1.04 Already low-level formatted at the factory with 6 spare sectors per cylinder and 1 spare cylinder/unit. ZBR = Zone Bit Recording = Variable sectors per track Seagate reserves the right to change, without notice, product offerings or specifications. (08/08/94)