�����������������ͻ
� RIGHT SIDE VIEW �
�����������������ͼ
BACK � J2 12345678 TOP (HDA) FRONT
OF J1�����������������������P�W�A����������������������� OF
DRIVE �; :::::::: BOTTOM DRIVE
��������
�Terminator Power ٳ������ Reserved
ڴTerminator Power �ٳ����� Start Delay (12 secs * ID)
� Factory Use ��ٳ���� Motor Start
� Parity Enable ������� Write Protect
�
�
� ��������������������������������Ŀ
�Ĵ Termination Power-source Table �
���������������������������������������������Ŀ
������....�����....�����PWA edge����� �
� �
� 1 2 1 2 1 2 �
� �ķ �ķ A Drive Supplies Bus �
� ���� ���� ��� B Drive Supplies Own �
� ��� ��� � �� C Bus Supplies Drive �
� A B C �
����������Default�������������������������������
����������������ͻ
� LEFT SIDE VIEW �
����������������ͼ 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 �ٳ�� ID 4
with PCB# 75782395 or � ID 2
#75782485 ID jumpers are��� ID 4 ID 1
reversed. �
������������ͻ
� FRONT VIEW �
������������ͼ
TOP (HDA) J6 ������1�
��P�W�A�������������������������͵::::::��
* BOTTOM ������;
� 123456
LED �� ������
ID 4 ٳ���� Reserved
ID 2 �ٳ��� 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)
