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



ST-9077A

                                      ÚÄ 44-pin I/O Connector (* see below)
                                      ³                     o o
                                    ::::::::::::ù::::::::1  o o
                               ÍPÍWÍAÍÍÍÍÍÍÍÍÍÍÍØÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
                                                ³           ³ ³
       pin-20 removed for keying ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ           ³ ³
                                                            ³ ³
                                                            ³ ³
 Drive is Master, no Slave drive present ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ 0 0
 Drive is Master, Seagate Slave drive present ÄÄÄÄÄÄÄÄÄÄÄÄÄ 1 0
 Drive is Slave to another ST9051A/ST9077A Master ÄÄÄÄÄÄÄÄÄ 0 1
 Reserved Position (Do Not Use) ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ 1 1

 * Drive uses +5vdc power supplied to the drive
   via the interface connector. The drive does
   NOT make use of a +12vdc power line.
   pin-41  +5vdc (Logic)
   pin-42  +5vdc (Motor)
   pin-43  Ground
   pin-44  Reserved

                            ST-9077A


       UNFORMATTED CAPACITY (MB) ________________N/A
       FORMATTED CAPACITY (39 SECTORS) (MB) _____64.0
       ACTUATOR TYPE ____________________________VOICE COIL
       TRACKS ___________________________________3,208
       CYLINDERS __PHYSICAL______________________802
       HEADS ______PHYSICAL______________________4
       DISCS (2.5 in) ___________________________2
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________RLL (2,7)
       TRANSFER RATE INTERNAL (mbits/sec)________12
       SPINDLE SPEED (RPM) ______________________3,546
       BUFFER ___________________________________32 KByte SeaCache
       INTERFACE ________________________________AT BUS
       SECTORS PER DRIVE ________________________125,112
       TPI (TRACKS PER INCH) ____________________1,750
       BPI (BITS PER INCH) ______________________45,007
       AVERAGE ACCESS (ms) ______________________<19
       SINGLE TRACK SEEK (ms) ___________________6
       MTBF (power-on hours) ____________________150,000
       POWER REQUIREMENTS: +5V START-UP (amps) __1.0
       POWER MANAGEMENT (Watts):
                           ACTIVE _______________3.0
                           IDLE _________________1.6
                           STANDBY ______________0.5
                           SLEEP ________________0.2
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________*

       Physical:
                        Height (inches/mm):     0.75/19.05
                        Width  (inches/mm):     2.76/70.10
                        Depth  (inches/mm):     4.01/101.85
                        Weight    (oz/kg):      6.5/0.18

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

Possible translation:   669 cyl, 11 heads, 17 sectors = 64,052,736

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

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. (9/25/91)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/at/st9077a.txt.