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



ST-9420AG (Marathon 420sl)

                            TOP       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 Seagate 2.5" Master ÄÄÄÄÄÄÄÄÄÄÄÄ 0 1
 Cable Select ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ 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-9420AG
                             Marathon 420sl 

       UNFORMATTED CAPACITY _____________________
       FORMATTED CAPACITY (xx SECTORS) __________420.8
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________
       CYLINDERS ________________________________
       HEADS ____________________________________4
       DISCS (2.5 in) ___________________________2
       MEDIA TYPE _______________________________THIN FILM
       HEAD TYPE ________________________________THIN FILM
       RECORDING METHOD _________________________ZBR PRML
       INTERNAL TRANSFER RATE (mbits/sec) _______up to 44
       EXTERNAL TRANSFER RATE (Mbytes) __________up to 16.6 
       PIO MODE (highest) _______________________4
       DMA MODE (highest) _______________________2
       SPINDLE SPEED (RPM) ______________________4,500
       AVERAGE LATENCY (mSEC) ___________________6.67
       BUFFER ___________________________________120 Kbyte
        Read/Write Multiple, Read Look-Ahead,
        Multi-Segmented, Adaptive
       INTERFACE ________________________________ATA
       SECTORS PER DRIVE (LBA mode) _____________822,016
       TPI (TRACKS PER INCH) ____________________3,807
       BPI (BITS PER INCH) ______________________90,000
       FCI (FLUX CHANGES PER INCH) ______________67,500
       AVERAGE ACCESS (ms) __(read/write)________16/20
       SINGLE TRACK SEEK (ms) __(read/write)_____6/7
       MAX FULL SEEK (ms) __(read/write)_________26/28
       MTBF (power-on hours) Office _____________300,000
       CONTACT START-STOP CYCLES ________________50,000
       SHOCK (G's) operating/nonoperating _______100/150
        SafeRite shock sensor
       ACOUSTICS __(dBA Max)__(idle/seek)________28/30
       POWER REQUIREMENTS: +5V START-UP (amps)___0.660
       POWER MANAGEMENT (Watts):
                           ACTIVE _______________1.95
                           IDLE _________________0.90
                           STANDBY ______________0.25
                           SLEEP ________________0.15
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO
       IBM AT DRIVE TYPE ________________________*

       Physical:
                        Height (inches/mm):     .504/12.80
                        Width  (inches/mm):     2.76/70.10
                        Depth  (inches/mm):     4.01/101.85
                        Weight    (oz/kg):      5.7/0.162


 * 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:   988 cyl, 16 heads, 52 sectors = 420,872,192

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. (01/24/95)

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/at/st9420ag.txt.