
M X T - 1 2 4 0 S D    MAXTOR
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    2389|     |     |
Capacity form/unform  1240/ 1524 MB        Heads          15|     |     |
Seek time   / track   8.5/ 1.8 ms          Sector/track     |     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation
Cache/Buffer           256 KB              Landing Zone
Data transfer rate          MB/S int       Bytes/Sector      512
                     10.000 MB/S ext SYNC
Recording method     RLL 1/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 55    |    -40 65
Power: sleep              W     Humidity     %         5 95    |      5 95
       standby            W     Altitude    km    -0.305  3.048| -0.305  3.048
       idle               W     Shock        g         3       |     50
       seek               W     Rotation   RPM      6300
       read/write    21.0 W     Acoustic   dBA        35
       spin-up            W     ECC        Bit   88,REED SOLOMON
                                MTBF         h     300000
                                Warranty Month        36
Lift/Lock/Park     YES          Certificates     CSA,FCC,IEC380,TUV,UL478


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MAXTOR   MXT-1240S  OEM TECHNICAL MANUAL 1028044 REV. A

  +---------------------------------------------------------+
  |      JP5+--+ +-+JP4       +-----+J7          JP8        |XX
  |         |  | +-+          1-----+           +---+   ++  |XX
  |+-+      +--1                                +---+   ||  |XX
  || |J4                                             RN2||  |XX
  |+-+                                                  ||  |XX
  |+-+   +--+JP2                                        +1  |XX J1
  || |   +--1                                           ++  |XX
  || |J2                                             RN1||  |XX
  || |                                                  ||  |XX
  || |                             +-+JP1               ||  |XX
  || |                             +-+                  +1  |XX
  |+-+                                           +J6----+   |XX
  |                                              1------+   |XX
  | +-+                                                     |X1
  | | |J5                                                   |
  | +-+                                                     |XX Power
  |                                                         |XX
  +---------------------------------------------------------+






    Tailgate PCB for Differential SCSI

          /--------------DRIVE-------------------------------------
        /                                                       / |
      /                                                       /   |
    +--------------------------------------------------------+    |
    |   XXXXXXXX    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX          |    |
    | 4 Pin male DC                 Male SCSI on Drive PCB   |    |
    | connector on Drive PCB                                 |    |
    |          +-------------------------------------------+ |    |
 4 female DC connector +----------------------------+Female|SCSI on
   XXXXXXXXX   |       +----------------------------+back side of |
    | | | |    |                                     tailgate PCB |
 +--+-+-+-+----+                                           | |    /
 | ++-+-+-++                                               | |  /
 | +-------+                 +---JP1                       | |/
 |                           |   |SCSI ID                  +-+
 |                           +---+                         |
 |                                                         |
 |                                                         |
 | J4                      J3                              |
 | XXXXXXXXX        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX        |
 +---------------------------------------------------------+
   Male Connector       Male SCSI Connector to SCSI Bus
   for Power Supply



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MAXTOR   MXT-1240S  OEM TECHNICAL MANUAL 1028044 REV. A

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

 x = Jumper set at factory


 J3  Power Connector
 -------------------
  ----+------------+   pin 1    +12 VDC
      | 4  3  2  1 |   pin 2    +12 Volts Return
  ----+------------+   pin 3    + 5 Volts Return
                       pin 4    + 5 VDC


 J4  Service Connector Pin Assignment
 ------------------------------------
     ----+------+------+------+------+------+---PCB
         |Pin 2 |Pin 4 |Pin 6 |Pin 8 |Pin 10|
         |CNMI  |DTR   |GND   |SPDL  |-LED  |
         |      |      |      |Pu.REF|DRV   |
         +------+------+------+------+------+
         |Pin 1 |Pin 3 |Pin 5 |Pin 7 |Pin 9 |
         |GND   |DTX   |GND   |N/C   |+ 5V  |
         |      |      |      |      |      |
         +------+------+------+------+------+
 When an LED is connected to pins nine and ten, it functions in the
 same manner as the LED which is mounted on the disk drive's face-
 plate. This is typically used in cases when the drive is mounted in a
 position where the LED is not visible or the faceplate is removed.

 Pins three (transmit data, DTX) and four (receive data, DTR) are the
 main communication lines. Pin two is for factory use only. Pins five
 and six are signal ground lines. Pin eigth is used to synchronize the
 spindles in multiple drive applications.



 J6  SCSI ID Setting
 -------------------
        +----------+
        | 9 7 5 3 1|
        |10 8 6 4 2|
        +----------+

 +--------+----------+-------+-------+-------+
 |SCSI ID | Priority | 5 & 6 | 3 & 4 | 1 & 2 |
 +--------+----------+-------+-------+-------+
 |   0    | Lowest   |OPEN   |OPEN   |OPEN   |
 |   1    |   .      |OPEN   |OPEN   |CLOSED |
 |   2    |   .      |OPEN   |CLOSED |OPEN   |
 |   3    |   .      |OPEN   |CLOSED |CLOSED |
 |   4    |   .      |CLOSED |OPEN   |OPEN   |
 |   5    |   .      |CLOSED |OPEN   |CLOSED |
 |x  6    |   .      |CLOSED |CLOSED |OPEN   |
 |   7    | Highest  |CLOSED |CLOSED |CLOSED |
 +--------+----------+-------+-------+-------+
                       (MSB)           (LSB)

 SCSI ID jumpers (pins one through six on J6) are provided to con-
 figure each disk drve with a SCSI device ID for use in multiple SCSI
 device configurations.

 An ID of seven is the highest priority in a multiple device
 configuration, and is usually used by the initiator.

 The disk drive is shipped from the factory with an ID of six. This
 assures that sufficient jumpers are available for any address except
 seven, which is usually reserved for the host system.


 J6 Parity
 ---------
 x  7-8  CLOSED  Enables Parity detection
         OPEN    Disables Parity detection

 Parity detection can be disabled by removing the jumper from pins
 seven and eight of J6. Odd parity detection is incorporated by the
 disk drive. Odd parity is always generated.



 J6  Drive Spin-Up Options (spin with power)
 -------------------------------------------
  x  9-10  CLOSED   Start when power is applied
           OPEN     Wait for START Command

 Wait for START Command:  With no jumper pins nine and ten of J6, the
 disk drive does not spin up until the initiator issues a START/STOP
 UNIT (1Bh) command with the start bit set to one.

 Start When Power is Applied: When pins nine and ten of J6 are
 jumpered, the motor starts as soon as power is applied. The disk
 drive is shipped in this configuration.



 J7  Single Ended or Differential
 --------------------------------

 Single Ended       Differential
      +---+           +---+
    12|o o|11       12|xxx|11
    10|o o|9        10|xxx|9
     8|o o|7         8|xxx|7
     6|o o|5         6|xxx|5
     4|xxx|3         4|o o|3
     2|o o|1         2|xxx|1
      +---+           +---+

 xxx = CLOSED

 The SCSI bus signals may be either single ended or differential. If a
 single ended signal is desired, configure J7 so that pins 3 and 4 are
 jumpered and all other pins are not.

      JP1 +-----------------+ SCSI ID on Tailgate PCB, Differential
          |6 o     o 5 (MSB)|
          |4 o     o 3      |
          |2 o     o 1 (LSB)|
          +-----------------+

 If a differential signal is desired, an optional "tailgate" PCB must
 be added to the drive. The tailgate PCB must have JP1 configured
 for the same ID as the disk drive. Additionally J7 (drive PCB) must
 have jumpers on pins 1 and 2, 5 and 6, 7 and 8, 9 and 10, and 11 and
 12, while pins 3 and 4 should not have a jumper.


 JP2/JP4/JP5  Test
 -----------------
 JP2, JP4 and JP5 are used during the manufacturing process for
 testing. After testing, the disk drive is shipped with JP4, the
 write protect jumper, installed, which write enables the drive.
 Removal of this jumper write protects the drive.


 JP8  Terminator Power Selection
 -------------------------------
 x    CLOSED  Terminator Power to the SCSI bus is protected by a fuse
              (1A) installed on the PCB.
      OPEN    The drive is prevented from supplying termination power
              to the SCSI bus.

 Power to the terminators may come internally from the disk drive or
 externally from the SCSI bus.

 The drive electronics are capable of sensing if the host is providing
 power to the terminators. If the host is not providing power, the
 disk drive automatically provides power to the terminators via a
 regulated (active) power source.

 The function of JP8 is the same for the single ended and differential
 versions.



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MAXTOR   MXT-1240S  OEM TECHNICAL MANUAL 1028044

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

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

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

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


 Drive Orientation
 -----------------
 The drives may be mounted on any axis. Certain switching power
 supplies may emanate electrical noise, which can degrade the
 specified read error rate. For best results, orient the drives so
 that the PCB assemblies are not adjacent to these noise sources.

 Twelve mounting holes, four on the bottom and four on each side, are
 provided for mounting each disk into an enclosure. The size and
 location of these holes are identical industry standards.

 Caution: Mounting screw lengths must be chosen so that no more than
 0.125 inch of the screw is available to enter the frame mounting
 hole. The PCB must have clearance. The torque applied to the mounting
 screws should be between 4 and 6 inchpounds.


 Air Flow Requirements
 ---------------------
 It is recommended that air flow over the PCB have a minimum velocity
 of 3.6 feet (1.1 meters) per second.


 Air Filtration System
 ---------------------
 The disks and read/write heads are assembled in a Class 100 environ-
 ment and then sealed within the HDA. The HDA contains an absolute
 filter, mounted inside the casing, to provide internal air
 filtration.


 Initiator-Target Configurations
 -------------------------------
 The SCSI interface offers a number of unique advantages which
 facilitate the interconnection of the disk drive with one (or more)
 computer systems. Unlike traditional microcomputer disk interfaces,
 such as ST506 or ESDI, SCSI supports multiple peripherals and
 different peripheral types, all operating on the same bus structure.


                 Single Host, Single Device
                 --------------------------

   +------------+                           +-----------+
   | HOST      x+-----------xxxx------------+x  SCSI    |
   | SYSTEM     +-----------xxxx------------+x  DEVICE  |
   +------------+           50-Pin          +|----------+
                            Ribbon Cable     | Terminator packs




                 Multiple Host, Multiple Device
                    (Single Ended Version)
                 ------------------------------

   +------------+                           +-----------+
   | HOST      x+---------------------------+*  SCSI    |
   | SYSTEM     +--+ +------------------+ +-+*  DEVICE 1|
   +------------+  | |                  | | +|----------+
                   | |                  | |  | Terminator packs
                   | |                  | |    Removed
                   | |                  | |
   +------------+  | |                  | | +-----------+
   | HOST      x+--+ |                  | +-+*  SCSI    |
   | SYSTEM     +----+                  | +-+*  DEVICE 2|
   +------------+                       | | +|----------+
                                        | |  | Terminator packs
                                        | |    Removed
                                        | |
                                        | | +-----------+
                                        | +-+x  SCSI    |
                                        +---+x  DEVICE 3|
                                            +|----------+
                                             | Terminator packs
                                               Installed


 The MXT-1240S also supports multiple initiator configurations
 consistent with the established arbitration cycle outlined in the
 SCSI standards. Configuration changes are made by SCSI address
 jumpers, which are set when the drive is installed in the system.

 The SCSI implementation used in the disk drive is intended to
 facilitate high-speed data transfers between the initiator and the
 drive. Interconnection between the initiator system(s) and the drive
 is via a fifty-pin ribbon cable. The drive may be configured as
 either single ended or differential.


 Interface Termination
 ---------------------
 Single Ended
 SCSI devicesrequire proper interface termination. The first physical
 device and the last physical device on a SCSI bus daisy chain must be
 terminated. Remove the terminators from any devices in between. For
 instance, if a disk drive is in the middle of a SCSI bus daisy chain,
 remove its terminators.

 The terminator resistor pack's pin one is marked with a dot, or other
 suitable marking, on the terminator. Note that the PCB's hole for pin
 one has a square outline. Also, note that pin one is always the
 closest pin to the power connector, J3.

 Note: Both terminator packs (RN1 and RN2) must be oriented with the
 dot (pin one) toward J3 for the disk drive to work properly.

 As shipped, the interface signal lines are terminated with two re-
 movable 1000 ohm resistor network packs supplied with an active
 voltage source of 2.85 volts. Resistor tolerances in the terminator
 network should be   5% or less.

 The devices driving the dis drive inputs should be open collector
 devices capable of sinking at least 48 milliamps at a voltage level
 of less than 0.5 volts DC (7438 or equivalent).

 Devices receiving the disk drive outputs should be of a SCHMITT
 trigger type to improve noise immunity (74LS14, 74LS240, or
 equivalent). The initiator should not load the bus with more than one
 standard low power Schottky transistor-transistor logic (LSTTL) load
 per input line, and should terminate all input signals with 100 ohm
 terminators with a regulated 2.85 volt power source.


 Differential
 With the installation of the optional "tailgate" PCB, RN1 and RN2
 must be changed from the factory installed 110 ohm value to a higher,
 1,000 ohm value.

 Note: The RN1 and RN2 terminator packs are "ultra-low profile"
 (maximum 3.5mm). Suggested vendors and part numbers are:
 1) Panasonic EXBU10E102G and
 2) Kyocera   TRDSA10PC102GA.


 Spindle Synchronization
 -----------------------
 The MXT-1240S disk drives are able to synchronize their spindles
 together for use in disk drive arrays. This is accomplished by having
 all drives in the array synchronized to a common pulsed index signal.
 This synchronous signal can be provided by either an external source
 or a master drive and can be transceived on the service connector
 (J4 pin 8).

 If the sync pulses are to be supplied by a drive, only one drive in
 an array may transmit it. All other drives will receive the sync
 pulses and synchronize their index pulses to it.

 The configuration for the synchronized-spindle bus is a twisted pair
 cable, daisy-chained from the master to each slave drive. This
 twisted pair cable is connected to the Service Connetor (J4) on each
 drive. The mating connector is a Dupont part number 69764-010 or Berg
 part number 6976410.

 The number of drives that can be attached to the array depends on the
 length of the bus connecting each drive to the source of the sync
 signal and the amount of current supplied by the terminating
 resistor. If the MXT-1240S drive is the signal source, it can sink
 15 mA. The maximum cable length is 3 meters.

 The source of the reference pulse must be at the far end of the
 transmission line, opposite the 2K ohm terminating resistor, which is
 between the signal and +5V.

 Note: The terminating resistor must be supplied by the user as part
 of the cable.


           System Cabling With One Drive in Master Mode
           --------------------------------------------

 +OPTIONAL-+ +---------+ +---------+ +---------+ +---------+
 |External | |Disk     | |Disk     | |Disk     | |Disk     |
 |Pulse    | |Drive    | |Drive    | |Drive    | |Drive    |
 |Source   | |MASTER   | |         | |         | |         |
 + + - - + + +-+-----+-+ +-+-----+-+ +-+-----+-+ +-+-----+-+
   + - - +     +6-8-9+     +6-8-9+     +6-8-9+     +6-8-9+
    |  |        | |         | |         | |         | |   2K
    |  + - - - -+ o---------+-o----SPDL-+-o---------+-o-
    + - - - - - o--Twisted--o-pair------o-cable--GND+

 After power is reset, the drive will be in an independent spindle
 mode, not configured for either a MASTER or SLAVE mode. Each drive
 must be configured for the appropriate mode of operation. This
 configuration is accomplished via a MODE SELECT command with Page 04h
 setting the RPL bits in byte 17, bits 0 and 1. The master drive will
 generate the spindle-synchronization sync pulses with the slave
 drives to receive the sync pulses. The connection between drives for
 the sync reference pulse, is a bi-directional line. The master can be
 either the host, a drive, or an external signal source which
 generates the sync reference pulse.


 J1  SCSI Connector
 ------------------
 The MXT-1240S communicates with an initiator system via a fifty-pin
 connector, J1. Pin one is located on the end of J1 closest to the DC
 power connector, J3.


 J3 Power Connector
 ------------------
 The four-pin DC power connector J3, is similar to AMP's MATE-N-LOCK
 connector part number 350543-1. J3 however, is surface mounted to the
 PCB rather than freehanging as the AMP part is. The recommended
 socket housing that is compatible with connector J3 is AMP part
 number 1-480424-0. The recommended female sockets that are compatible
 with connector J3 are AMP socket part numbers 350078-4 (strip) or
 61173-4 (loose piece).



 J4 Service Connector
 --------------------
 Connector J4 is a 10-pin service connector provided for serial input,
 the synchronous spindle, and LED source current. Its mating
 connector is a Berg 6976410 part.



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MAXTOR   MXT-1240S   OEM TECHNICAL MANUAL 1028044 REV. A

 Drive Mechanism
 ---------------
 The HDA is a sealed subassembly containing the mechanical portion of
 the disk drive. A brushless DC motor contained within the spindle hub
 rotates the spindle and is controlled by a dedicated microprocessor.
 Shock mounting is provided internally in the HDA and externally at
 vibration isolators to minimize transmission of vibration through the
 frame. The frame is the mechanical assembly holding the HDA and PCB.


 Sector Size
 -----------
 The disk drive is shipped from the factory formatted with a default
 size of 512 bytes. Sector sizes of 514, 520, and 1,024 bytes are also
 supported.


 Error Conditions
 ----------------
 When the drive fails to achieve synchronization, a UNIT ATTENTION
 condition with an Additional Sense Code (ASC) of 06h with an
 Additional Sense Code Qualifier (ASCQ) of 5Ch (RPL status change)
 will be posted. Additionally, if subsequent to achieving
 synchronization, the drive detects a loss of synchronization and no
 I/O operation is beeing executed, a check condition of UNIT ATTENTION
 with RPL status change will be posted.


 Error Correction
 ----------------
 The MXT-1240S disk drive contains an 88-bit Reed Solomon error
 correction code which is non-interleaved. Different than the Maxtor
 ECC implementations, this error correction code resides in the hard-
 ware within the Cirrus SH-450 SCSI controller IC. This allows for
 "in-line" or "on the fly" correction of single burst errors up to 11
 bits in length without any mechanical delays or interruption of data.
 Additional error correction capability for double burst or greater
 than 11-bit errors resides in the firmware or "off-line" and is
 invoked as part of the error recovery algorithm.

 The 88-bit ECC, both hardware and firmware correction codes, provides
 increased error correction capability, thus allowing a significant
 improvement in both the recovered and unrecovered error rates along
 with a very low miscorrection probability.


 Seek Time
 ---------

                                          |MXT1240S|
        ----------------------------------+--------+
        Single Track Read      msec.      |  <1.5  |
                     Write     msec.      |   2.0  |
        Average Seek           msec.      |   8.5  |
                     To Read   msec.      |   8.5  |
                     To Write  msec.      |   9.5  |
        Full Stroke            msec.      |  20.0  |
        Latency                msec. avg. |   4.76 |
        ----------------------------------+--------+



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MAXTOR    SCSI INSTALLATION

         GENERIC INSTALLATION PROCEDURE FOR A SCSI DRIVE
   -----------------------------------------------------------

 1. Install a 50 pin ribbon connector making sure 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 SCSI ID selection.
    Note: SCSI ID usually needs to be set to 0 to be the boot drive.
    The last physical device on the SCSI bus must be terminated.
    Any other drive or SCSI device connected between the host and
    the device at the end of the bus must not be terminated.

 4. Apply power to the computer.

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

  4b. Set the drive type to "Not Installed". This intelligent drive
      will identify itself to the SCSI host adapter.

 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: Maxtor SCSI drives are low-level formatted at the factory)

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


