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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1991



ST-280A (94204-81 or 94204-71) Wren 2 HH AT (IDE)


                          ΪΔΔ Master on /Slave off
                          ³
                          ³   Factory    Ϊ12ΔGΔGΔ5ΔΏ Power
     AT Cable Connector   ³   1  J2      ³ 0 0 0 0 ³
   1::::::::ω::::::::::   ::  :::::::::  \Δ1Δ2Δ3Δ4Δ/
  ΝΝΝΝΝΝΝΝΝΝΡΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝ
            pin-20 key     ³
                           ³  ³ For "non-C" model, jumper, if present,
                           ³  ³ must remain on. Drive will not operate
                           ΐΔΔ΄ properly if jumper is removed (or added
                              ³ if not originally there).
                              ³
                              ³ For "C" model, jumper on indicates No
                              ³ Slave Present; jumper off means Slave
                              ³ Drive Is Present.
                              ΐΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔΔ

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-defined" 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)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/at/st280a.txt.