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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(C)opyright 1991
ST-280A (94204-81 or 94204-71) Wren 2 HH AT (IDE)
��� Master on /Slave off
�
� Factory �12�G�G�5Ŀ Power
AT Cable Connector � 1 J2 � 0 0 0 0 �
1::::::::�:::::::::: :: ::::::::: \�1�2�3�4�/
����������������������������������������������������
pin-20 key �
� � For "non-C" model, jumper, if present,
� � must remain on. Drive will not operate
��Ĵ properly if jumper is removed (or added
� if not originally there).
�
� For "C" model, jumper on indicates No
� Slave Present; jumper off means Slave
� Drive Is Present.
�������������������������
Note: There are two different revisions of the ST280A
1. If you have a 94204-xxC, then you can connect two different
model drives on the same host adapter. (i.e. a 94204-xxC and
a 94354-xxx drive)
2. If you do not have a "C" after the model number, then you
can only connect two similar Wren 2 94204-xx model drives.
ST-280A
94204-71 WREN 2 HH
UNFORMATTED CAPACITY (MB) ________________80.6
FORMATTED CAPACITY (27 SECTORS) (MB) _____71.3
ACTUATOR TYPE ____________________________VOICE COIL
TRACKS ___________________________________5160
CYLINDERS ________________________________1032
HEADS ____________________________________5
DISCS ____________________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________RLL
TRANSFER RATE (mbytes/sec) _______________0.937
SPINDLE SPEED (RPM) ______________________3,600
BUFFER ___________________________________32 Kbyte
Read Look-Ahead, Non-Adaptive,
Single-Segmented Buffer
INTERFACE ________________________________AT
TPI (TRACKS PER INCH) ____________________960
BPI (BITS PER INCH) ______________________14357
AVERAGE ACCESS (ms) ______________________29
SINGLE TRACK SEEK (ms) ___________________5
MTBF (power-on hours) ____________________40,000
POWER REQUIREMENTS: +12V START-UP (amps) _4.5
+12V TYPICAL (amps) __1.5
+5V START-UP (amps) __0.6
+5V TYPICAL (amps) ___0.4
TYPICAL (watts) ______20
MAXIMUM (watts) ______58
BUFFERED STEP PULSE RATE (micro sec) _____
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl) _______________________AUTO PARK
IBM AT DRIVE TYPE ________________________45, *
* MAY REQUIRE FORMATTING AND PARTITIONING SOFTWARE. ALSO, CHECK TO
SEE IF YOUR CMOS SETUP HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE
AVAILABLE.
Possible Translation: 1024 cyl, 8 heads, 17 sectors = 71,303,168
Possible Translation: 516 cyl, 10 heads, 27 sectors = 71,331,840
Possible Translation: 745 cyl, 11 heads, 17 sectors = 71,329,280
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)".
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)
