SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
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� United States +1 408 438-8771 � United Kingdom +44 628 478011 �
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� Germany +49 89 140-9331 � Singapore +65 227-2217 �
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(C)opyright 1991
ST-277N SCSI
5 G G 12
�SCSI Cable /�4�3�2�1�\
o o o (o) o �...�.....................� � O O O O � Power
o o o (o) o ........................1 �����������
������������������������������������������������������������
1 2 4 � P 1����� 1����� 1����� Terminating Resistors
����� � �� Parity Check enable
� ����� Some PWA's have an extra jumper here
���������� ID Selects, ID 0 (none) for single drive system
ST - 277N
UNFORMATTED CAPACITY (MB) ________________77
FORMATTED CAPACITY (26/34* SECTORS) (MB) _64.9
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________4,920/3,768*
CYLINDERS ________________________________820/628*
HEADS ____________________________________6
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL (2,7)
TRANSFER RATE (mbits/sec) ________________7.5/10*
SPINDLE SPEED (RPM) ______________________3,600
AVERAGE LATENCY (mSEC) ___________________8.3
INTERFACE ________________________________SCSI
SECTORS PER DRIVE ________________________126,875
TPI (TRACKS PER INCH) ____________________777
BPI (BITS PER INCH) ______________________14,902/19,869*
AVERAGE ACCESS (ms) ______________________40/28*
SINGLE TRACK SEEK (ms) ___________________8
MAX FULL SEEK (ms) _______________________ /70
MTBF (power-on hours) ____________________70,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0/2.5*
+12V TYPICAL (amps) __0.5
+5V TYPICAL (amps) ___1.2/1.4*
TYPICAL (watts) ______12/13*
MAXIMUM (watts) ______30/37*
BUFFERED STEP PULSE RATE (micro sec) _____3-200
WRITE PRECOMP (cyl) ______________________N/A (821/629*)
REDUCED WRITE CURRENT (cyl) ______________N/A (821/629*)
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE ________________________0 or NONE
*ST277N-0/ST277N-1
Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)
