
S T 9 4 2 0 A    SEAGATE
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 2.5"/SUPERSLIMLINE    Cylinders        |  988|     |
Capacity form/unform   420/      MB        Heads           4|   16|     |
Seek time   / track  16.0/ 6.0 ms          Sector/track     |   52|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer               KB              Landing Zone
Data transfer rate    5.000 MB/S int       Bytes/Sector      512
                     16.600 MB/S ext
Recording method     PRML                           operating  | non-operating
                                                  -------------+--------------
Supply voltage     5 V          Temperature *C         5 55    |    -40 70
Power: sleep          0.2 W     Humidity     %                 |
       standby        0.3 W     Altitude    km                 |
       idle           0.9 W     Shock        g        10       |    300
       seek           1.9 W     Rotation   RPM      4500
       read/write     2.0 W     Acoustic   dBA        24
       spin-up            W     ECC        Bit
                                MTBF         h     300000
                                Warranty Month        36
Lift/Lock/Park     YES          Certificates                                  

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SEAGATE  ST9420AG  MARATHON 420SL  JUMPER SETTING


  +---------------------------------------------------------+
  |                                                         |XX
  |                                                         |XXI
  |                                                         |XXN
  |                                                         |XXT
  |                                                         |XXE
  |                                                         |XXR
  |                                                         |XXF
  |                                                         |XXA
  |                                                         |XXC
  |                                                         |XXE
  |                                                         |XX
  |                                                         |XX
  |                                                         |XX
  |                                                         |  1
  |                                                         |XXJumper
  +---------------------------------------------------------+



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                      J   U   M   P   E   R   S
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SEAGATE  ST9420AG  MARATHON 420SL  JUMPER SETTINGS

 Jumper Setting
 ==============


 +--+  +Jumper--------Interface-----------------------------+  +--+
 |  +--+Bo oD   o o o o o o o o o   o o o o o o o o o o o o +--+  |
 |  |  |Ao oC   1 o o o o o o o o o o o o o o o o o o o o o |  |  |
 |  |  +--+-------------------------------------------------+  |  |
 |  +-----+----------------------------------------------------+  |
 +--------+-------------------------------------------------------+
          |
         o o    Drive is master; slave may be detected using DASP-
         o o    signal

         o X    Drive is master; Seagate slave drive present
         o X

         X o    Drive is slave; Seagate master drive present
         X o

         X X    Use CSEL pin grounding to differate master from slave
         X X


 Install master/slave jumpers
 ----------------------------
 In a two-drive system, you need to designate one drive as the master,
 or drive 0, and the other drive as the slave, or drive 1. In a one-
 drive system, configure the drive as a master (no jumpers installed).

 Alternatively, you can configure the drive as a master or slave
 using the cable select option. To use this option, the host system
 and both drives must support cable select. Cable selection requires
 a special daisy-chain cable that grounds pin 28 (CSEL) on one of its
 two drive connectors. If you attach the drive to the grounded CSEL
 connector, it becomes a master. If you attach the drive to the
 ungrounded CSEL connector, it becomes a slave.

 To configure an ST9420 drive for cable select, install both master/
 slave jumpers.


 Master/slave configuration
 --------------------------
 You must establish a master/slave relationship between two drives
 attached to a single AT bus. You can configure a drive to become a
 master or slave by setting the master/slave jumpers.

 Alternatively, you can configure the drive as a master or slave using
 the cable select option. This requires a specialized daisy-chain
 cable that grounds pin 28 (CSEL) on one of its two drive connectors.
 If you attach the drive to the grounded CSEL connector, it becomes a
 master. If you attach the drive to the ungrounded CSEL connector, it
 becomes a slave. To use this option, the host system and both drives
 must support cable select and both drives must be configured for
 cable select. To configure a Marathon 420sl for cable select, install
 both master/slave jumpers.

 For the host to recognize the slave drive using the DASP- signal, the
 slave drive must assert the DASP- signal at power up, and the master
 drive must monitor DASP- at power up.


 Remote LED configuration
 ------------------------
 The drive indicates activity to the host through the DASP- line (pin
 39) on the ATA interface. This line may be connected to a drive
 status indicator driving an LED at 5V. The line has a 30 mA nominal
 current limit. To avoid potential damage to the drive, the host
 should include a resistor in the line to the LED. This resistor
 should have a minimum resistance of 470 ohms (1,000 to 3,000 ohms
 recommended).



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SEAGATE  ST9420AG  INSTALLATION GUIDE

 Notes on installation
 =====================

 Installation direction
 ----------------------

     horizontally                           vertically
   +-----------------+             +--+                       +--+
   |                 |             |  +-----+           +-----+  |
   |                 |             |  |     |           |     |  |
 +-+-----------------+-+           |  |     |           |     |  |
 +---------------------+           |  |     |           |     |  |
                                   |  |     |           |     |  |
                                   |  |     |           |     |  |
 +---------------------+           |  +-----+           +-----+  |
 +-+-----------------+-+           +--+                       +--+
   |                 |
   |                 |
   +-----------------+

 The drive will operate in all axis (6 directions).


 Mounting the drive
 ------------------
 Mount the drive securely in the computer using M3X0.5 metric screws
 in the four bottom mounting holes or the four side mounting holes.

 You can mount the drive in any orientation. Be careful not to strain
 or crimp the interface/power cable.

 Caution. To prevent damage to the drive:

 - Be careful not to bend the drive connector pins, especially when
   plugging the drive into a fixed connector.

 - Use mounting screws of the correct size and length.

 - Gently tighten the mounting screws_do not apply more than 3
   inch-pounds of torque.

 - Do not insert mounting screws more than 0.15 inch.

 Note. This drive meets industry-standard MCC mounting specifications.
       When installing this drive in a fixed-mounting application, you
       must use MCC-compatible connectors and mounting hardware. If
       the mounting holes in your computer do not line up with the
       mounting holes on the drive, your computer may not be
       MCC-compatible.


 Attaching cables
 ----------------
 This drive is designed for a host computer that supplies interface
 signals and +5V power through a single 44-pin connector and cable.

 1. Turn off the computer and remove the battery.

 2. Put on a grounded wrist strap.

 3. Open your computer case. See your system manual for instructions.
    Caution. Opening the case may void your computer's warranty.

 4. Connect the 44-pin interface/power cable. Match pin 1 of the cable
    to pin 1 of the interface connectors on the drive and on the
    computer. Pin 1 is usually denoted by a stripe along one edge of
    the cable. The cable should be no longer than 18 inches (0.457
    meters).

    Caution. The printed-circuit cables used in laptop computers are
             very delicate. Be careful not to tear them.



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                      F   E   A   T   U   R   E  S
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SEAGATE  ST9420AG  INSTALLATION GUIDE

 Read before you begin
 ---------------------
 Application. This drive uses the ATA interface and is designed for
 IBM AT and compatible personal computers. It is intended for use with
 UL-listed computers or similar products.

 Warning. Turn off the computer (and remove the battery if you have a
          notebook or laptop computer) before you open the case or
          touch any internal components.

 Caution. Special training or tools may be needed to service laptop
          and notebook computers. In some cases, opening the case
          may void your warranty.

 Static discharge
 Observe the following precautions:
 - Before handling any components, put on a grounded wrist strap.

 - Use antistatic padding on all work surfaces.

 - Avoid static-inducing carpeted areas.

 - Keep the drive in its static-shielded bag until you are ready to
   complete the installation. Do not attach any cables to the drive
   while it is in its static-shielded bag.

 - Handle the drive by its edges or frame.

 - Do not touch the I/O connector pins or the circuit board.


 Drive handling
 --------------
 The drive is extremely fragile_handle it with care.
 Do not attach labels to any part of the drive.


 Inspection
 ----------
 After you are familiar with the handling precautions listed above,
 inspect the drive. If it appears to be damaged, call your distributor
 or dealer immediately.


 Maintenance and repair
 ----------------------
 Seagate drives do not require maintenance.
 The head/disc assembly is sealed; if you break the seal, you void the
 warranty. Seagate customer service centers are the only facilities
 authorized to repair Seagate drives. Seagate does not sanction any
 third-party repair facilities.


 Configuring the drive
 ---------------------
 1. Put on a grounded wrist strap. Wear the grounded wrist strap
    throughout the installation procedure.

 2. Install master/slave jumpers. In a two-drive system, you need to
    designate one drive as the master, or drive 0, and the other drive
    as the slave, or drive 1.


 Configuring your computer
 -------------------------
 Before your computer can recognize a new drive, you must enter basic
 information about the drive into the computer's longterm memory
 (usually a battery-powered CMOS chip). The computer's basic
 input/output system (BIOS) uses this information to control the flow
 of data to and from the drive.

 Note. Some newer computers can automatically determine your drive
       type and configure themselves appropriately at startup. Read
       your system manual to determine whether this applies to your
       computer. If so, then skip ahead to "Formatting and
       partitioning the drive. If your computer cannot automatically
       determine your drive type, you must run a system setup program
       to specify the number of cylinders, heads and sectors for each
       drive in your system. This procedure is described on the
       following page. The table below lists cylinder, head and sector
       information for the Marathon 420sl.

       No. cylinders         988
       No. read/write heads  16
       No. sectors per track 52
       Total no. sectors     822,016
       Bytes per sector      512
       Capacity (Mbytes): BIOS calculated 400 Usable 420

 To enter these drive specifications into your system BIOS, follow
 these steps:

 1. Turn on your computer.

 2. Run the system setup program. This program configures the system
    BIOS to recognize your drive. In some computers you run the system
    setup program by pressing special keys while the computer is
    booting up. In other computers, you can run the program from the
    DOS prompt. See your system manual for more information.

 3. Enter your drive specifications. Within the system setup program,
    there are three possible ways that you can enter your drive's
    specifications. These are listed below in order of increasing
    complexity.

   - Select a predefined drive type. Most system setup programs
     provide a long list of predefined drive types. Select a drive
     type with specifications that match those of your drive.

   - Specify a custom or user defined drive type. If the system setup
     program doesn't list a predefined drive type that matches your
     drive specifications, you may be able to define a custom or
     user defined drive type. You can then enter your drive
     specifications.

     When you enter drive specifications for a custom or user defined
     drive type, the setup program should display a drive capacity
     less than or equal to the BIOS calculated capacity.
     This value is slightly lower than the usable drive capacity.

    - Allow your drive to emulate or translate one of the predefined
      drive types. If none of the predefined drive types exactly
      matches your drive, and your system setup program does not allow
      you to specify a custom drive type, your drive may be able to
      emulate one of the predefined drive types. Select a predefined
      drive type that has a capacity as close as possible to, but not
      greater than, the BIOS calculated capacity of your drive.

 Note. If you emulate a drive type with a lower storage capacity than
       your drive, you limit the effective capacity of your drive. For
       example, a 350-Mbyte drive emulating a 300-Mbyte drive will be
       limited to 300 Mbytes of storage capacity.

       If you are not sure which drive type to select, try running the
       FINDTYPE.EXE utility program. This program is available from
       Seagate's Technical Support services (on the SeaBOARD computer
       bulletin board). FindType compares your drive's geometry with
       all geometries supported by your computer's BIOS. FindType can
       also determine whether an exact match exists between the drive
       geometry and the system BIOS. If there is no match, FindType
       selects the closest drive type supported by your computer's
       BIOS.

       The system setup program may request information on the drive's
       write precomp or landing zone. However, you do not need to
       enter any values, since your Seagate drive does not use these
       parameters.

 Caution. Write down the drive type that you have selected and any
          drive specifications that you have entered. Keep this
          information in a safe place. You will have to reenter this
          data if your CMOS battery fails.


 Formatting and partitioning the drive
 -------------------------------------
 Caution. Formatting or partitioning a drive that contains data may
 destroy all data on the drive. Before repartitioning or reformatting
 a drive that contains data, make sure all data on that drive has been
 safely backed up. Seagate Technology assumes no liability for lost
 data.


 Low-level formatting
 --------------------
 Seagate ATA Interface drives are low-level formatted at the factory
 and do not require additional low-level formatting before use.

 Note. If you are installing only a single drive in your computer, you
       can use the DOS program SETUP.EXE (supplied with MS-DOS 5.0
       and above) to partition and format the drive. See your DOS
       manual for details. After you successfully run SETUP.EXE, your
       drive will be ready to use, and you can skip the partitioning
       and formatting steps below.


 Partitioning
 ------------
 The partitioning process subdivides a single disc drive into
 partitions that behave as separate logical drives (labeled C, D, E,
 etc.). You can also set up the entire disc as a single partition.

 1. Restart your computer. Boot up the computer using a diskette that
                           contains DOS system files.
 2. Run the FDISK program. Insert a DOS program diskette containing
                           the FDISK program into your diskette drive.
                           At the DOS prompt, type fdisk and press
                           ENTER. Then follow the directions on the
                           screen to create one or more partitions.
                           See your DOS manual for details. If you are
                           partitioning a drive that will be used to
                           boot the computer, make sure that the
                           primary partition is marked active.


 High-level formatting
 ---------------------
 High-level formatting verifies the information written by the
 low-level format and creates file allocation tables used to catalog
 and access files.

 Caution. Make sure that you know the correct drive letter for the
          partition you wish to format. Formatting a drive that
          contains data may destroy the data on that drive.

 1. Run the FORMAT program. Insert a DOS program diskette containing
                            the FORMAT program into your diskette
                            drive. At the DOS prompt, type format,
                            followed by the drive letter for the first
                            drive partition you want to format (for
                            example, format C:). Then, press ENTER.
                            Repeat this procedure to format each of
                            the new drive partitions you have created.
                            Consult your DOS manual for FORMAT command
                            options.

 Note. If you are formatting the drive partition that will be used to
       boot your computer (the "C" drive), copy the DOS system files
       to this drive. To do this, type /s after the format command
       (for example, format C: /s)

 2. Verify the drive capacity. After high-level formatting a drive,
                               you can verify the usable drive
                               capacity by running the DOS CHKDSK
                               utility program.


 Storing and shipping your drive
 -------------------------------
 Keep your original box and packing materials for storing or shipping
 your drive. The box has a Seagate Approved Package label. Shipping a
 drive in an unapproved container voids the warranty. Call your
 authorized Seagate distributor to purchase additional boxes.


