
7 5 4 6 A    MAXTOR
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders    2771| 1024|     |
Capacity form/unform   546/      MB        Heads           4|   16|     |
Seek time   / track  12.0/ 1.5 ms          Sector/track     |   63|     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer           256 KB SEGMENTED    Landing Zone
Data transfer rate    4.600 MB/S int       Bytes/Sector      512
                     11.100 MB/S ext
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 71
Power: sleep          0.7 W     Humidity     %         5 95    |      5 95
       standby        0.7 W     Altitude    km    -0.061  3.048|
       idle               W     Shock        g        10       |     70
       seek           5.0 W     Rotation   RPM      4500
       read/write     3.7 W     Acoustic   dBA        32
       spin-up       18.5 W     ECC        Bit   REED SOLOMON,WITH 11BIT BU...
                                MTBF         h     300000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,FCC,TUV,UL1950,VDE       

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MAXTOR   7546A  OEM PRODUCT MANUAL PART #1251 REV. P2

  +---------------------------------------------------------+
  |                                           +-+-+-+-+     |
  |                                           +++++++++     |
  |                                        J25-+ |J23+--J22 XX
  |                                        J24---+    +-+   XX
  |                                                   +-+J20XX
  |                                                   +-+J19XX
  |                                                   +-+J18XX J1
  |                                                   +-+J17X*
  |                                                   +-+J16XX
  |                                                         XX
  |                                                         XX
  |                                                         XX
  |                                                         XX1-2
  |                                                         | 1
  |                                                         XX Power
  |                                                         XX J2
  +---------------------------------------------------------+



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MAXTOR   7546A  OEM PRODUCT MANUAL PART #1251 REV. P2

 Jumper setting
 ==============

 Note: Jumpers J25, J22, J19 and J17 factory reserved.


 J16  I/O Channel Ready
 ----------------------
      J16 CLOSED  Option Enabled
      J16 OPEN    Option Disabled (default)


 J18  Low Power Spin Mode
 ------------------------
      J18 CLOSED  Enabled
      J18 OPEN    Disabled (default)


 J20  Master/Slave
 -----------------
      J20 CLOSED  Only drive in single drive system (Default)

      J20 CLOSED  Master in dual drive system

      J20 OPEN    Slave in dual drive system



 J23  Write Cache
 ----------------
      J23 OPEN    Enabled (default)
      J23 CLOSED  Disabled


 J24  Cable Select
 -----------------
      J24 OPEN    Disabled (default)
      J24 CLOSED  Enabled



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MAXTOR   7546A  OEM PRODUCT MANUAL PART #1251 REV. P2

 Notes of Installation
 =====================

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

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

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


 Recommended Mounting Configuration
 ----------------------------------
 Maxtor 7000 Series drive design allows greater shock tolerance than
 that afforded by larger, heavier drives. The drive may be mounted in
 any attitude using four size 6-32 screws with 1/8" maximum
 penetration.

 Allow adequate ventilation to the drive to ensure reliable drive
 operation.


 Air Filtration System
 ---------------------
 All 7000 Series drives are designed to operate in a typical
 office environment with minimal 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
 --------------------------
 Four low mass, low force read/write heads record data on two 3.5"
 diameter disks. Maxtor uses a sputtered thin film medium on all
 disks for 7000 Series drives.


 Drive Meachanism
 ----------------
 A brushless DC direct-drive motor rotates the spindle at 4,500 RPM
 (  0.1%). The dynamically balanced motor/spindle assembly ensures
 minimal mechanical runout to the disks. A dynamic brake provides a
 fast stop to the spindle motor upon power removal. The speed
 tolerance includes motor performance and motor circuit tolerances.


 Voice Coil Actuator
 -------------------
 All 7000 Series drives employ a rotary voice coil actuator which
 consists of a moving coil, an E-block or actuator arm assembly, and
 stationary magnets. The actuator moves on a low-mass, low-friction
 center shaft. The low friction generated contributes to fast average
 access time and low power consumption.


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


 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,
 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. When J20 is closed (factory
 default), the drive assumes the role of master; when open, the drive
 acts as a slave. In single drive configurations, J20 must be closed.

 Cable Select
 ------------
 CSEL (cable select) is an optional feature per ATA CAM specification.
 Drives configured in a multiple drive system are identified by CSEL's
 value:

 - If CSEL is grounded, then the drive address is 0.
 - If CSEL is open, then the drive address is 1.


 Sector Address Translation
 --------------------------
 All 7000 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).

 The 7546A powers-up in the Translate Mode:

 Cylinders  Heads  Sectors
  1024       16       63


 Interface Connector
 -------------------
 All 7000 Series AT drives have a 40-pin interface 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).

 (Striped Edge = Pin 1)


 Buffer Segmentation
 -------------------
 The data buffer is organized into three segments: the read buffer,
 the write buffer, and an micro controller scratch pad. The read
 segment occupies half of the buffer and operates as a circular read-
 ahead buffer. The write segment occupies the other half. During write
 operations, it contains the host write data. Commands ATA Read Buffer
 (E4) and ATA Write Buffer (E8) are implemented per CAM specification
 4a.


 Read-Ahead Mode
 ---------------
 Normally, this mode is active. Following a read request, disk read-
 ahead begins on the first sector and continues sequentially until the
 buffer is full. If a read request is received during the read-ahead
 operation, the buffer is examined to determine if the request is in
 the cache. If a cache hit occurs, read-ahead mode continues without
 interruption and the host transfer begins immediately.



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MAXTOR   7546A  OEM PRODUCT MANUAL PART #1251 REV. P2


 Introduction
 ------------
 Maxtor 7000 Series AT disk drives are 1" high, 3.5" random access
 storage devices which incorporate an on-board AT controller. Maxtor
 engineers have applied recent advances in hard drive technology to
 the design and manufacture of these drives. High data transfer rates
 and fast access times make the 7546A especially well-suited to high-
 end desktop and entry level workstation applications.


 Defect Management
 -----------------
 The 7546A has three (3) spare sectors per cylinder, located at the
 end of each cylinder. Upon detection of a bad sector 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 2 spare sectors still
 allocated for that cylinder. This push down method assures maximum
 performance.

 In the rare occurrence that the number of reassigned bad sectors
 exceed the number of spare sectors allocated for that cylinder, an
 alternate track at the inner diameter of the disk is used. The 7546A
 has four (4) alternate tracks.


 Error Correction Code
 ---------------------
 The 7546A uses a Reed-Solomon code for error detection and
 correction. The error correction polynomial can correct one error
 burst with a maximum of 11 bits. Individual bursts (  11 bits) are
 corrected without any resulting performance degradation.


 Zone Density Recording
 ----------------------
 The disk capacity is increased with bit density management - common
 with Zone Density Recording. Each disk surface is divided into 8
 circumferential zones. All tracks within a given zone contain a
 constant number of data sectors. The number of data sectors per track
 varies in different zones; the outermost zone contains the largest
 number of data sectors, and the innermost contains the fewest.


 Seek Time
 ---------
       +----------------------------------+--------+
       |Track-to-Track         msec. typ. |   1.5  |
       +----------------------------------+--------+
       |Average                msec. typ. |  12    |
       |                       msec. max. |  28    |
       +----------------------------------+--------+
       |Controller overhead    msec.      |   0.4  |
       +----------------------------------+--------+
       |Latency                msec. avg. |   6.66 |
       +----------------------------------+--------+


 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)        |
  +-----------+----------------------------------+
                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.


 EISA Type "B" and Type "F" DMA Modes
 ------------------------------------
 Direct Memory Access (DMA) transfers improves system performance by
 significantly improving troughtput.


 Physical Configuration Sectors per track
 ----------------------------------------
 Zone 1 = 114    Zone 2 = 112    Zone 3 = 108
 Zone 4 = 102    Zone 5 =  96    Zone 6 =  88
 Zone 7 =  80    Zone 8 =  72


 Data transfer rate (MBytes per second)
 --------------------------------------
 Zone 1 = 5.57    Zone 5 = 4.52
 Zone 2 = 5.45    Zone 6 = 4.27
 Zone 3 = 5.25    Zone 7 = 3.84
 Zone 4 = 5.00    Zone 8 = 3.47

 To/from buffer    17.5
 To/from interface 11.1


 1:1 Interleave Operation
 ------------------------
 Since all 7000 Series drives operate with a 1:1 interleave,
 "optimizing" interleave for a host system is unnecessary. Regardless
 of the host system's speed, the drive's 256K buffer allows all disk
 transfers to occur at a one-to-on erate. Since these drives always
 format with interleave 1, they override any interleave specified in
 the FORMAT command.


