
7 4 2 0 A V    MAXTOR
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/SLIMLINE         Cylinders        |     |     |
Capacity form/unform   422/      MB        Heads           3|     |     |
Seek time   / track  14.0/ 3.0 ms          Sector/track     |     |     |
Controller           IDE / ATA2 FAST/ENHA  Precompensation
Cache/Buffer            32 KB SEGMENTED    Landing Zone
Data transfer rate    3.500 MB/S int       Bytes/Sector      512
                     11.100 MB/S ext PIO3
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 71
Power: sleep          0.4 W     Humidity     %         5 95    |      5 95
       standby        0.5 W     Altitude    km    -0.061  3.048|
       idle           3.8 W     Shock        g        35       |    120
       seek           4.3 W     Rotation   RPM      3551
       read/write     4.1 W     Acoustic   dBA
       spin-up       10.3 W     ECC        Bit   ON THE FLY,REED SOLOMON
                                MTBF         h     300000
                                Warranty Month        24
Lift/Lock/Park     YES          Certificates     CSA,FCC,TUV,UL478,VDE        

**********************************************************************
                        L   A   Y   O   U   T
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MAXTOR   7540AV/7420AV/7270AV  PRODUCT MANUAL 1272 P6; 1994

  +---------------------------------------------------------+
  |                                       J20-+-+-+-+-+-J25 |
  |                                         +-+-+-+-+-+-+   |
  |                                                         |
  |                                                         XX
  |                                                         XX
  |                                                         XX
  |                                                         XX J1
  |                                                         X*
  |                                                         XX
  |                                                         XX
  |                                                         XX
  |                                                         XX
  |                                                         XX1-2
  |                                                         | 1
  |                                                         XX Power
  |                                                         XX J2
  +---------------------------------------------------------+



**********************************************************************
                      J   U   M   P   E   R   S
**********************************************************************
MAXTOR   7540AV/7420AV/7270AV  PRODUCT MANUAL 1272 P6, 08/09/94

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

 Note: Jumpers J21 and J25 are factory reserved.
 A spare shunt is shipped between J23 and J24.


 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


 J22 Default Parameters (7540AV only)
 ------------------------------------
     J22 OPEN   1046 x 16 x 63 (default)
         CLOSED 1024 x 16 x 63


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


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



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                      I   N   S   T   A   L   L
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MAXTOR   7540AV/7420AV/7270AV  PRODUCT MANUAL 1272 P6, 08/09/94

 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 3,551 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.

 NOTE
 If the Cable Select jumper (J24) is installed, the Master/Slave
 jumper (J20) will be ignored.


 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).

 These drives powers-up in the Translate Mode:

 Model   Cylinders  Heads  Sectors
 7540AV    1024       16     63
 7270AV     959       11     50


 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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                      F   E   A   T   U   R   E  S
**********************************************************************
MAXTOR   7540AV/7420AV/7270AV  PRODUCT MANUAL 1272 P6 08/09/94


 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 them especially well-suited to desktop and
 workstation applications.


 Defect Management Zone (DMZ)
 ----------------------------
 Each drive model has a fixed number of spare sectors per DMZ; 7540AV
 = 8, 7420AV = 6, 7270AV = 4, all of which are located at the end of
 each DMZ. 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
 ---------------------
 All models use a Reed-Solomon code for error detection and
 correction. The error correction polynomial can correct one error
 burst with a maximum of 22 bits or two bursts with a maximum of 11
 bits each. Individual bursts (  11 bits) are corrected through
 on-the-fly correction hardware without any 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. |   3    |
       +----------------------------------+--------+
       |Average                msec. typ. |  14    |
       |                       msec. max. |  31    |
       +----------------------------------+--------+
       |Controller overhead    msec.      |   0.7  |
       +----------------------------------+--------+
       |Latency                msec. avg. |   8.45 |
       +----------------------------------+--------+


 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 = 123    Zone 2 = 120    Zone 3 = 112
 Zone 4 = 104    Zone 5 =  96    Zone 6 =  87
 Zone 7 =  80    Zone 8 =  72


 Data transfer rate (MBytes per second)
 --------------------------------------
 Zone 1 = 4.75    Zone 5 = 3.57
 Zone 2 = 4.58    Zone 6 = 3.33
 Zone 3 = 4.25    Zone 7 = 3.03
 Zone 4 = 3.95    Zone 8 = 2.70


 Logical Block Addressing
 ------------------------
 The Logical Block Address (LBA) mode can only be utilized into
 systems that support this form of translation. The cylinder, head and
 sector geometry of the drive, as presented to the host, differs from
 actual physical geometry.

 The host AT computer may access a drive of set parameters: number of
 cylinders, heads, and sectors per track, plus cylinder, head and
 sector addresses. However, the drive can't use these host parameters
 directly because of zoned recording techniques. The drive translates
 the host parameters to a set of logical internal addresses for data
 access.

 The host drive geometry parameters are mapped into an LBA based on
 this formula:

 LBA    = (HSCA-1)+HHDAxHSPT+HNHDxHSPTxHCYA  (1)
        = (HSCA-1)+HSPTx(HHDA+HNHDxHCYA)     (2)

 where  HSCA = Host Sector Address, HHDA = Host Head Address
        HCYA = Host Cylinder Address, HNHD = Host Number of Heads
        HSPT = Host Sectors per Track

 The LBA is checked for violating the drive capacity. If it does not,
 the LBA is converted to physical drive cylinder, head and sector
 values. The physical address is then used to access the data stored
 on the disk and other drive related operations.


