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Hard Drive: MAXTOR: 25252A 251MB 2.5"/SSL IDE / AT

2 5 2 5 2 A    MAXTOR
NO MORE PRODUCED                                      Native|  Translation
Form                 2.5"/SUPERSLIMLINE    Cylinders    1418|  569|     |
Capacity form/unform   251/      MB        Heads           6|   16|     |
Seek time   / track  12.0/ 2.5 ms          Sector/track     |   54|     |
Controller           IDE / AT              Precompensation
Cache/Buffer           128 KB              Landing Zone
Data transfer rate    2.000 MB/S int       Bytes/Sector      512
                      9.000 MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
Supply voltage     5 V          Temperature *C         5 50    |    -40
Power: sleep          0.1 W     Humidity     %                 |
       standby        0.1 W     Altitude    km    -0.061  3.048|
       idle           0.9 W     Shock        g        15       |    150
       seek           1.6 W     Rotation   RPM      4247
       read/write     2.0 W     Acoustic   dBA        30
       spin-up        2.8 W     ECC        Bit   REED SOLOMON,WITH 11BIT BU...
                                MTBF         h     350000
                                Warranty Month        12
Lift/Lock/Park     YES          Certificates     CSA,FCC,TUV,UL478,VDE        



  |                                                         |
  |                                                        42XX  5V
  |                                                         |XX
  |                                                         |XX I
  |                                                         |XX N
  |                                                         |XX T
  |                                                         |XX E
  |                                                        20.X R
  |                                       S302              |XX F
  |                                         |               |XX A
  |                                  S301+-+-+-+-+S304      |XX C
  |                                      +-+-+-+-+          |XX E
  |                                           |             |X1
  |                                         S303            AxxD Test
  |                                                         |

     |                                                          |
     |      +Pin 41 +5V Supply                                  |
     |   +--+-----------------------------------------------+   |
     |   +-+++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+   |
     |   | |.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|.|1| |.| A|   |
     |   | |.|.|.|.|.|.|.|.|.|.|.| |.|.|.|.|.|.|.|.|.| |.| D|   |
     |   +-+++-+-+-+-+-+-+-+-+-+-+++-+-+-+-+-+-+-+-+-+-+-+-++   |
     +---+  |                     20 Key                   |+---+
            Pin 42                        Factory Test Point
            +5V Supply



 Jumper Setting
 |                                  |S301  |S302  |S303  |S304  |
 |Master/Slave                      |      |      |      |      |
 |Only drive in single drive system*|CLOSED|      |      |      |
 |                                  |      |      |      |      |
 |Master in dual drive system       |CLOSED|      |      |      |
 |                                  |      |      |      |      |
 |Slave in dual drive system        |OPEN  |      |      |      |

 |                                  |S301  |S302  |S303  |S304  |
 |Reserved for factory              |      |      |      |      |
 |Normal operation*                 |      |      |OPEN  |OPEN  |
 |                                  |      |      |      |      |
 |Factory operation                 |      |      |CLOSED|CLOSED|

 |                                  |S301  |S302  |S303  |S304  |
 |Idle Mode Latch                   |      |      |      |      |
 |Option Disabled                   |      |OPEN  |      |      |
 |                                  |      |      |      |      |
 |Option Enabled*                   |      |CLOSED|      |      |

* = Default



Notes of Installation

Installation direction

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

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

Recommended Mounting Configuration
Maxtor 25000 Series drive design allows greater shock tolerance
than that afforded by larger, heavier drives.

The drive may be mounted in any attitude. Allow adequate ventilation
to the drive to ensure reliable operation over the operating
temperature range.

Host Equipment
Maxtor built hard drives to meet the highest quality standards.
Like all system peripherals, they depend on host equipment for
adequate power and environment in order to realize their full
performance potential and to operate in compliance with applicable
industry and governmental regulations.

Special attention must be given to:
- Safety

- Power distribution

- Shielding

- Audible noise control

- Temperature regulation and

- Electrostatic discharge (ESD).

128K Look-Ahead Cache
Caching with look-ahead read decreases access time to sequential data
in the drive by temporarily placing small amounts of data in high
speed memory. To maximize performance, no head switching or seek-
ing occurs during look-ahead.

How Look-ahead Cache Functions
In the absence of an error, corrected data, or an interrupt command,
the drive caches not only requested sectors, but "look-ahead" and
caches all remaining until the cache is full. The "look-ahead"
feature prepares the drive to transfer cached data when the host
request it (preventing access time delays). Commands are interrupt
driven, so if the drive is performing a look-ahead cache when a
command is received, it will stop caching and process the command.

Resets and Write or Write Long commands to any of the cached sectors
invalidate the whole cache. Sector on a track are cached until an
error occurs, until corrected data is read, or until a host command
interrupts the drive.

Air Filtration System
All 25000 Series drives are designed to operate in a field or
office environment with minimum environmental control. Over the life
of the drive, a 0.3 micron filter and breather filter (located within
the HDA) maintain a clean environment to the heads and disks.

Read/Write Electronics
An integrated circuit mounted within the sealed enclosure (near the
read/write heads) provides one of four head selection (depending on
the model), read preamplification, and write drive circuitry.

Read/Write Heads and Disks
Low-mass, low-force thin film read/write heads record data on 65 mm
diameter disks. Maxtor uses a sputterred thin-film medium, with
glass/canasite substrate on all disks for 25000 Series drives.

Automatic Headpark and Lock
Immediately following power-down, dynamic braking of the spinning
disks delays momentarily allowing the heads move to an inner
mechanical stop. A small magnetic latch holds the heads in place as
the disk spin down. The heads are released only when power is again

Acoustic Noise
Averages are recorded during Idle mode.

      Sound power (per ISO/DIS 7779)            3.4 belA

      Sound Pressure
      (1 meter perpendicular to top cover)     30 dBA

      Sound Pressure
      (seated operator position, per ISO 7779) 32.5 dBA

Drive Mechanism
A brushless DC direct-drive motor rotates the spindle at 4,247 RPM
( 0.1%). A dynamic brake provides a fast stop to the spindle motor
upon power removal. The speed tolerance includes motor performance
and motor circuit tolerances.

Dual Drive Support
Two drives may be accessed via a common interface cable, using the
same range of I/O addresses. The drives are jumpered as drive 0 or 1
Master/Slave, and are selected by the drive select bit in the
Drive/Head register of the task file.

All Task File registers are written in parallel to both drives. The
interface processor on each drive decides whether a command written
to it should be executed; this depends on the type of command and
which drive is selected. Only the drive selected executes the command
and activates the data bus in response to host I/O reads; the drive
not selected remains inactive.

A master/slave relationship exists between the two drives: drive 0
is the master, and drive 1 the slave.

Interface Connector
All 25000 Series AT drives have a 44-pin interface/power connector
mounted on the PCBA. The drive may connect directly to the host; or
it can also accommodate a cable connection (maximum cable length:
18 inches).

The four separate pins on the interface connector are solely for
factory test purposes and should be left disconnected.

Electrical Description
All signal levels are TTL compatible. A logic "1" is > 2.0 volts.
A logic "0" ranges from 0.00 volts to 0.70 volts.



The Maxtor 25000 Series are 2.5-inch ruggedized high-performance AT
interface hard disk drives. Maxtor engineers have applied recent
advances in hard drive technology to the design and manufacture of
the 25000 Series drives; reduced size and increased durability make
them especially well suited to notebook, laptop, and desktop

Sector Address Translation
25000 Series drives feature a Universal Translate Mode. In an
AT-class system, the drive may be configured to any specified
combination of cylinders, heads and sectors (within the range of the
drive's formatted capacity).

 Seek Time
       |Track-to-Track         msec. typ. |   2.5  |
       |Average                msec. typ. |  12    |
       |                       msec. max. |  22    |
       |Latency                msec. avg. |   7.064|

Defect Management
The 25252A/25084A have six (6)/two (2) spare sectors per cylinder,
located at the end of each cylinder. Upon detection of a bad sectors
that has been reassigned, the next sequential sector is used.

The first spare sector makes up for the loss of sector 3, and so
maintains the sequential order of data, with 3 spare sectors still
allocated for that cylinder. This push down method assures maximum

In the rare occurence that the number of reassigned bad sectors
exceeds the number of spare sectors allocated for that cylinder, an
alternate track at the inner diameter of the disk is used. The 25252A
has six (6) alternate tracks and 25084A has two (2)

Error Correction Code
The 25252A and 25084A use a Reed-Solomon cde for error detection and
correction. The error correction polynomial can correct one error
burst with a maximum of 11 bits. Individual bursts are corrected
without any resulting performance degradation.

Execute Drive Diagnostics
Commands the drive to implements the internal diagnostics tests.
(These tests are executed only upon command receipt; they do not run
automatically at power up or after a reset.)

The drive sets BSY immediately upon receiving this command.

This table presents the codes and their descriptions:

Note that the value in the Error register should be viewed as a
unique 8 bit Code.

   Error Code | Description
       01     | no error detected
       02     | formatter device error
       03     | sector buffer error
       04     | ECC circuitry error
       05     | controller microprocessor error
       8x     | slave drive failed

                Note: If a slave drive fails diagnostics, the master
                drive OR's 80 hex with its own status, and loads that
                code into the Error register.

                If a slave drive passes diagnostics (or a slave is
                absent), the master drive OR's 00 with its own status
                and loads that code into the Error register.



 1. Install a 40 pin Data Cable ensuring that pin 1, which can be
    identified by the striped edge of the cable, is closest to the
    power connector on the drive.

2. Install a DC power cable to the back of the drive.

 3. Verify the jumper configurations for Master/Slave operation
    (Note:  Master will be the bootable drive. The slave will not
    be bootable.) Also make sure the existing C: drive is jumped
    to be the Master in a two drive system, not the only drive in
    the system.

4. Apply power to the computer.

 4a. When memory test is complete go into your system's Standard
     CMOS set-up.
     (Note: There are various ways to get into CMOS set-up, please
     refer to system's manual for instructions.)

 4b. If your system's BIOS supports a user programmable drive
     type, program the BIOS with the default parameters of your
     drive. If your system does not support a user programmable
     drive type choose parameters that closely match but do not
     exceed the drives MegaByte capacity. Escape from set-up
     then choose write to CMOS and exit.

 5. Boot from a DOS diskette that has FDISK.EXE and FORMAT.COM on
    it. At the A> prompt type in FDISK. At the menu options select
    option 1 to create a DOS partition. Another menu will appear
    and from those options choose 1 to create a Primary DOS
    partition. Select yes to make 1 large partition and it will
    automatically become active. Then escape from FDISK.

 6. At the A> prompt type in FORMAT C:/S This does a high-level
    format on the drive and transfers the system files in order for
    the drive to be bootable. (Note: IDE drives are low-level
    formatted from the manufacturer and only need a high-level

    To configure the drive as a slave drive repeat steps 1-4 and
    proceed with steps 5a. and 6a. as follows:

  5a. At the C> prompt type in FDISK. When the menu options appear
      select option 5 to switch to the second drive. Enter fixed
      disk drive number 2. Then choose option 1 to create a DOS
      partition, then select option 1 again to create a Primary DOS
      partition or option 2 to create an Extended DOS partition.
      (Note: C and D drives will always be the Primary partitions
      but only the Primary partition on C: will have a status of

  6a. Proceed with a high-level format on the drive by typing FORMAT
      D: (Note: Make sure the correct drive letter has been selected
      for format).

 7. The drive is now bootable. As a test remove the DOS diskette
    from A and press reset to reboot the computer,  a  C> should be
    displayed, the drive is now ready for operation.

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