SEAGATE TECHNOLOGY, INC.

SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
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(C)opyright 1991

ST-157A

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6-pin jumper version �O O O O�
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o o o �::::::::::::::::::::1�
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� 0 1 Single Drive 0=open
� 1 1 Dual-Drive Master 1=closed
� 1 0 Dual-Drive Slave
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�� Optional External LED

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10-pin jumper version �O O O O�
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o o o o o �::::::::::::::::::::1�
o o o o o ��;
� � � � �
� � � � � LT (Life Test, factory use only)
� � 0 1 Single Drive 0=open
� � 1 1 Dual-Drive Master 1=closed
� � 0 0 Dual-Drive Slave
� �� EWS (factory use only)
�� Active Busy (Optional External LED)

ST - 157A

UNFORMATTED CAPACITY (MB) ________________57
FORMATTED CAPACITY (26 SECTORS) (MB) _____44.7
ACTUATOR TYPE ____________________________STEPPER
TRACKS ___________________________________3,360
CYLINDERS ________________________________560
HEADS ____________________________________6
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL (2,7)
TRANSFER RATE (mbits/sec) ________________7.5
SPINDLE SPEED (RPM) ______________________3,600
AVERAGE LATENCY (mSEC) ___________________8.3
BUFFER ___________________________________2 Kbyte
INTERFACE ________________________________AT BUS
SECTORS PER DRIVE ________________________87,360
TPI (TRACKS PER INCH) ____________________824
BPI (BITS PER INCH) ______________________20,280
AVERAGE ACCESS (ms) ______________________40/28*
SINGLE TRACK SEEK (ms) ___________________8
MAX FULL SEEK (ms) _______________________ /70
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0
+12V TYPICAL (amps) __0.35
+5V TYPICAL (amps) ___0.9
TYPICAL (watts) ______9
MAXIMUM (watts) ______29
BUFFERED STEP PULSE RATE (micro sec) _____3-200
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE ________________________36,(or 14, 17 or 21)**

*ST157A-0/ST157A-1

Possible translation: 733 cyl, 7 heads, 17 sectors = 44,660,224
Possible translation: 1024 cyl, 5 heads, 17 sectors = 44,564,480

Note: A "custom" or "user-definded" CMOS drivetype may ask for a
numerical value for the Write Precompensation cylinder and for the
Landing Zone cylinder. A basic rule-of-thumb for drive models that do
not require the old Write Precomp technique or a Landing Zone because
they are Auto-Parking is to add 1 to the cylinder value being used. As
an example: If cylinders equaled 820, then both Write Precomp and
Landing Zone would be entered as 821. Some BIOS will convert this to
65535 or -1, which are functionally equivalent to "none (not used)".

** MAY REQUIRE FORMATTING AND PARTITIONING SOFTWARE. ALSO, CHECK TO
SEE IF YOUR CMOS SETUP HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE
AVAILABLE.

PHYSICAL/LOGICAL equivalent to NATIVE/TRANSLATION

WARNING - Already low-level formatted at the factory.

Since a User-definable or Custom translation geometry may be used, it
is imperative that the values be written down and kept with your
permanent records for retrieval in the event of CMOS battery failure.

Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)