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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1995


ST-31640A (Medalist 1640 AT)

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  º REAR VIEW º
  ÈÍÍÍÍÍÍÍÍÍÍͼ

         40 pin I/O Cable Connection
         ³
    J1     ÕÍÍÍÍÍÍÍÍÍ  ÍÍÍÍÍÍÍÍ͸ /ÄÄÄÄÄÄÄÄÄ\    TOP (HDA)
     ÍÍÍÍÍ͵::::::::::ú::::::::1Æͳ 0 0 0 0 ³ÍÍ
           ÔÍÍÍÍÍÍÍÍÍͳÍÍÍÍÍÍÍÍ; ÀÄ5ÄGÄGÄ12Ù    BOTTOM
                      ³
                      ÀÄÄÄ pin-20 removed

    ST-31640A
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 º  Front View  º
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                            Slave drive ON (OFF for Master) ÄÄÄÄÄÄ¿
                             Slave Present (used on Master) ÄÄÄÄ¿ ³
                 Master/Slave timing protocol causes Master ÄÄÂÄ´ ³
                  drive to wait up to 31 seconds for slave    ³ ³ ³
    (TOP)         to respond. Must be used with pins 3-4      ³ ³ ³
                                                              ³ ³ ³
                                                        o o o o o o1
Option Block   ÍÍÍÍÍPWAÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ12o o o o oÂo2ÍÍ
                                                        ³ ³ ³    ³
  (BOTTOM)                       Remote LED (11-, 12+) ÄÙ ³ ³    ³
                                          Cable Select ÄÄÄÙ ³    ³
                                              Reserved ÄÄÄÄÄÙ    ³
                       Spare jumper stored on pins 2-4 ÄÄÄÄÄÄÄÄÄÄÙ



                             ST-31640A
                             Medalist 1640

       FORMATTED CAPACITY _______________________1625.7
       ACTUATOR TYPE ____________________________VOICE COIL
       CYLINDERS __PHYSICAL______________________4,834
       HEADS ______PHYSICAL______________________6
       DISCS (3.5 in) ___________________________3
       MEDIA TYPE _______________________________THIN FILM
       HEAD TYPE ________________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (Mbits/sec) _______34.5 to 67.7
       EXTERNAL TRANSFER RATE (Mbytes/sec) ______up to 16.6
       PIO MODE _________________________________4
       DMA SUPPORT ______________________________EISA Type B
       SPINDLE SPEED (RPM) ______________________5,376
       AVERAGE LATENCY (mSEC) ___________________5.58
       BUFFER ___________________________________128/256 Kbyte SeaCache
        Read/Write Multiple, Read Look-Ahead,
        Multi-Segmented
       INTERFACE ________________________________ATA
       SECTORS PER DRIVE (LBA mode) _____________3,175,200
       TPI (TRACKS PER INCH) ____________________4,800
       BPI (KBITS PER INCH) _____________________76.2
       AVERAGE ACCESS (ms) ______________________10
       SINGLE TRACK SEEK (ms) ___________________2.0
       MAX FULL SEEK (ms) _______________________20
       MTBF (power-on hours) Office _____________500,000
       SHOCK (G's):
                operating (Read/Write) __________2
                abnormal ________________________5
                nonoperating ____________________75
       ACOUSTICS (bels) (typ/max) _______________4.1/4.9
       POWER DISSIPATION (watts) ________________
       POWER REQUIREMENTS: +12V START-UP (amps) _1.6
       POWER MANAGEMENT (Watts):
                           ACTIVE _______________8.41
                           IDLE _________________4.60
                           STANDBY ______________0.755
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO
       IBM AT DRIVE TYPE ________________________*

       Physical:
                        Height (inches/mm):  1.02/25.4
                        Width  (inches/mm):  4.02/102.1
                        Depth  (inches/mm):  5.78/146.6
                        Weight    (lbs/kg):   1.5/0.68


 * 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 translations:
                       This translation is generally acceptable, as
                       is, for non-DOS operating systems:
       3150 cyl, 16 heads, 63 sectors = 1,625,702,400

                       DOS operating systems may require a system bios
                       that accepts larger values for the CMOS head
                       parameter which lowers cylinders below 1024:
        787 cyl, 64 heads, 63 sectors = 1,624,670,208

                       Other FULL-CAPACITY solutions for DOS operating
                       systems include third-party drive preparation
                       software, system BIOS which supports LBA mode
                       or bios driven host adapters. Otherwise,
                       capacity may be limited to:
       1024 cyl, 16 heads, 63 sectors = 528,482,304


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
ZBR = Zone Bit Recording = Variable sectors per track

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. (02/19/96)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/at/st31640a.txt.