
P T 3 5 7 R    PTI
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders     615|     |     |
Capacity form/unform    49/   58 MB        Heads           6|     |     |
Seek time   / track  35.0/12.0 ms          Sector/track   26|     |     |
Controller           RLL / ST412           Precompensation 65535
Cache/Buffer               KB              Landing Zone      614
Data transfer rate    0.938 MB/S int       Bytes/Sector      512
                      0.938 MB/S ext
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C         5 50    |    -40 60
Power: sleep              W     Humidity     %         8 80    |      5 95
       standby        5.0 W     Altitude    km    -0.457  3.000| -0.610 12.000
       idle               W     Shock        g         3       |     80
       seek               W     Rotation   RPM      3517
       read/write     6.5 W     Acoustic   dBA        45
       spin-up            W     ECC        Bit
                                MTBF         h      25000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,TUV,VDE                  

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PTI      PT225/PT338/PT238R/PT357R  OEM MANUAL

  +---------------------------------------------------------+/ J4
  |        +-J5----+                                  +-+   |XX
  |        +-------+                                J10 |   |XX
  |                                           Resistor| |   |XX
  | +J9--+                                            | |   |XX
  | +----+                                            +-+   |XX
  |                                                   +-+   |XX
  |                                                  J6 |   |XX
  |                                                   | |   |XX J1
  |                                                   | |   |XX
  |                                                   +-+   |
  |                                                         |XX
  |                                                         |XX J2
  |                    +-J7-----+                           |XX
  |                    +--------+                           |XX
  |                                       +-J8-----+        |XX
  |                                       +--------+        |XX   XXJ3
  |                                                               XX
  +---------------------------------------------------------+   Power



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                      J   U   M   P   E   R   S
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PTI      PT225/PT338/OT238R/PT357R  OEM MANUAL

 Jumper setting
 --------------

 x = Jumpers are set at factory


 J1  Control Signals
 -------------------
      +----------+---------+---------------+------------+
      |Ground Re-| Signal  |  Function     | Direction  |
      |turn Pin  | Pin     |               |            |
      +----------+---------+---------------+------------+
      |    1     |    2    | (Reserved)    | Input      |
      +----------+---------+---------------+------------+
      |    3     |    4    | Head Select 2 | Input      |
      +----------+---------+---------------+------------+
      |    5     |    6    | Write Gate    | Input      |
      +----------+---------+---------------+------------+
      |    7     |    8    | Seek Complete | Output     |
      +----------+---------+---------------+------------+
      |    9     |   10    | Track         | Output     |
      +----------+---------+---------------+------------+
      |   11     |   12    | Write Fault   | Output     |
      +----------+---------+---------------+------------+
      |   13     |   14    | Head Select 2*| Input      |
      +----------+---------+---------------+------------+
      |   15     |   16    | (Reserved)    | To J2-7    |
      +----------+---------+---------------+------------+
      |   17     |   18    | Head Select 2 | Input      |
      +----------+---------+---------------+------------+
      |   19     |   20    | Index         | Output     |
      +----------+---------+---------------+------------+
      |   21     |   22    | Ready         | Output     |
      +----------+---------+---------------+------------+
      |   23     |   24    | Step          | Input      |
      +----------+---------+---------------+------------+
      |   25     |   26    | Drive Select 1| Input      |
      +----------+---------+---------------+------------+
      |   27     |   28    | Drive Select 2| Input      |
      +----------+---------+---------------+------------+
      |   29     |   30    | Drive Select 3| Input      |
      +----------+---------+---------------+------------+
      |   31     |   32    | Drive Select 4| Input      |
      +----------+---------+---------------+------------+
      |   33     |   34    | Direction In  | Input      |
      +----------+---------+---------------+------------+
 The pin assignment follow industry standard practice for the designa-
 ted functions.


 J2  Data Signals
 ----------------
      +----------+---------+---------------+------------+
      |Ground Re-| Signal  |  Function     | Direction  |
      |turn Pin  | Pin     |               |            |
      +----------+---------+---------------+------------+
      |    1     |    2    | Drive Selected| Output     |
      +----------+---------+---------------+------------+
      |    3     |    4    | (Reserved)    | Output     |
      +----------+---------+---------------+------------+
      |    5     |    6    | Write Protect | Input      |
      +----------+---------+---------------+------------+
      |    7     |    8    | (Reserved)    | To J1-16   |
      +----------+---------+---------------+------------+
      |    9     |   10    | Spare         |            |
      +----------+---------+---------------+------------+
      |   11     |   12    | Ground        |            |
      +----------+---------+---------------+------------+
      |          |   13    | +Write Data   | Input      |
      +----------+---------+---------------+------------+
      |          |   14    | -Write Data   | Input      |
      +----------+---------+---------------+------------+
      |   15     |   16    | Ground        |            |
      +----------+---------+---------------+------------+
      |          |   17    | +Read Data    | Output     |
      +----------+---------+---------------+------------+
      |          |   18    | -Read Data    | Output     |
      +----------+---------+---------------+------------+
      |   19     |   20    | Ground        |            |
      +----------+---------+---------------+------------+
      The data signal connector pin assignment follow industry
      standard practice for the designated functions.


 J3  D-C Power Supply
 --------------------
   Viewed from mating side
   +---------+
   | 4 3 2 1 |
   +-+-+-+-+-+
     | | | +----------  +12 VDC,        Wired Color: Red
     | | +------------  +12 VDC return, Wired Color: Black
     | +--------------  + 5 VDC return, Wired Color: Black
     +----------------  + 5 VDC,        Wired Color: Yellow

 Pin Assignments - The d-c power connector pin assignment follow
 industry standard practice for the designated functions.


 J6   Drive Adress
 -----------------
   +---------------+
   |     J6        |
   ++-+-+-+-+-+-+-++
    * * * * * * * *
    | | | | | | | |
    | | | | | | | +----------  Drive Select 1
    | | | | | | +------------  Drive Select 2
    | | | | | +--------------  Drive Select 3
    | | | | +----------------  Drive Select 4
    +-+-+-+------------------  Factory use only

 In multidrive installatons (up to maximum of four drives per host
 controller) it is necessary to configure each drive with a unique
 address. Each drive is shipped from the factory addressed as Drive 1.
 The drive may be changed to 2, 3, or 4 by changing the jumper socket
 on J6. Plug J6 is mounted on the printed circuit board immediately
 behind plug J1.

 Note: The other four pairs of pins on plug J6 are used for factory
 diagnostics. They must not be jumpered in normal field use because
 drive malfunction and data erasure could result.



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PTI      PT225/PT338/PT238R/PT357R  OEM MANUAL

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

 Installation direction
 ----------------------
 The drive can be mounted in any position!


 Mounting the Drive
 ------------------
 3 " Configuration

 The drive can be mounted in any position, making it ideal for
 portable applications. Overall width, height, and depth, mounting
 holes, and other key dimensions are compatible with industry standard
 minifloppy disk drives, to allow direct interchangeability.

 Sixteen 6-32 UNC-2B tapped mounting holes are provided, however only
 four are normally used a time. Eigth holes are provided for two
 alternative methods for side mounting, and eigth are for two alter-
 native methods for bottom mounting.

 The drive mounting frame must be used as part of the enclosure
 structure. Mounting points must be adjustable or resilient to prevent
 placing any undue stress on the drive mounting frame.

 The drive assembly is attached to the mounting frame with four shock
 mounts. Two precautions must be observed to assure the effectiveness
 of the shock mounts: Sufficient clearence must be provided around the
 drive assembly to allow at last 0.1" movement during acceleration,
 and mounting screw length must be chosen to engage no more than six
 threads (3/16") to prevent the screws interfering with the drive ass-
 embly. This will also assure that the screws will not bottom out in
 the blind-tapped holes.

 The mounting screws should be tightened to at least 9 inch-pounds,
 but no more than 11 inch-pounds.

 The usual open interior construction of the host enclosure will
 normally provide adequate convection cooling within the temperature
 limits given in the specifications of the drive.

 5 " Configuration

 Optional bracket may be supplied already attached to the two sides of
 the drive mounting frame, to permit the drive to be inter inter-
 changeably used in standard 5  applications. One set of four base-
 mounting holes and two sets of four side-mounting holes are provided.
 Normally only one set of holes is used in time. The holes are tapped
 6-32 UNC-2B.


 Caution:
 PTI drives are precision products that have been engineered to
 withstand normal handling when installed according to the accompany-
 ing instructions. However, they should be handled with the care
 warranted by any precision instrument and not dropped, jarred, or
 bumped. When the drive is not in its shipping container or installed
 in its properly designed host enclosure, it must be stored on a soft
 padded conductive (antistatic) surface.
 Failure to comply with the above procedure will void all warranties.


 Available Configuration
 -----------------------
 The PTI drives covered by this manual are the Models PT225, PT338,
 PT238R, and PT357R. These model numbers refer to the basic 3 " micro
 Winchester package.  The distinguishing differences are as follows:

   PT225:   A two-disk drive designed for MFM applications.
   PT338:   A three-disk drive designed for MFM applications.
   PT238R:  A two-disk drive designed for RLL(2,7) applications.
   PT357R:  A three-disk drive designed for RLL(2,7) applications.

 Each of these four basic models is also available with adapter brack-
 ets suitable for mounting the drive in a chassis designed for
 standard 5 " half-height drives.

 Each of the models may also be supplied with an optional bezel
 incorporating an activity LED.

 The 5 " mounting versions are packed one to a shipping carton, the
 basic 3 " versions are packed one or two to a shipping carton.


 Wiring Method
 -------------
 Wiring for J1 and J2 should be in separate cables, and may be flat
 ribbon cable or twisted pairs. Cables from the drive to the host
 should be no longer than 20 feet. Wires for J3 and J4 should be no
 smaller than #18 AWG.

 Single-Drive Systems - In a single drive system, all wiring runs
 directly from the drive to the host system. Cables for J1 and J2
 should run directly to the controller. Wires for J3 should run
 directly to the host power bus and the frame ground on J4 should run
 directly to the host system frame ground point.

 Multi-drive Systems - When a system contains more than one drive, a
 multiplexing process is used to direct thecontrol signals to or from
 the appropriate drive. The Control signals on J1 may be "daisy-
 chained" from one drive to the next.


                MULTIDRIVE SYSTEM INTERCONNECTIONS
                ----------------------------------

         HOST
      +----------+  CONTROL               +---------------------+
      |          |x---o------------------x|J1                   |
      |          |    |  +---DATA1-------x|J2      Drive #1     |
      |          |    |  |     +---------x|J3   J4              |
      |          |    |  |     |          +-----x---------------+
      |Controller|    |  |     |   +------------+
      |          |    |  |     |   |      +---------------------+
      |          |    o--+-----+---+-----x|J1                   |
      |          |    |  |  +-DATA2+-----x|J2      Drive #2     |
      |          |    |  |  |  o---+-----x|J3   J4              |
      |          |    |  |  |  |   |      +-----x---------------+
      |          |    |  |  |  |   o------------+
      |          |    |  |  |  |   |      +---------------------+
      +----------+    o--+--+--+---+-----x|J1                   |
      +----------+x---+--+  | ++---+-----x|J2      Drive #3     |
      |          |    |     | |o---+-----x|J3   J4              |
      |          |x---+-----+ ||   |      +-----x---------------+
      |Encoder/  |    |       ||   o------------+
      |Decoder   |x---+-DATA3-+|   |      +---------------------+
      |          |    +--------+---+-----x|J1                   |
      |          |x--DATA4-----+---+-----x|J2      Drive #4     |
      |          |             o---+-----x|J3   J4              |
      +----------+             |   |      +-----x---------------+
                               |   |            |
           DC VOLTAGES   ------+   o------------+
           (RADIAL)                |
                                   |
           FRAME GROUND  ----------+
           (RADIAL)



 Bezel
 -----
 An optional bezel may be provided already mounted for the 3  or 5
 configuration. An activity LED is provided on the front of the bezel,
 and plugs into J9 on the front of the printed circuit board.


 Mechanical Interface
 --------------------
 Mechanically incorporating the drive into a host system entails
 making provision for securely mounting the drive frame and dressing
 the cables for the external electric connections.


 Electrical Interface
 --------------------
 Electrical connections to the drive are made through two double-sided
 card-edge connectors (J1, J2), a cable plug (J3), and a frame ground
 lug (J4). The general functional category of each connector is as
 follows:

    J1 Control Input and Output Signals
    J2 Data Input and Output Signals (plus DRIVE SELECTED and WRITE
       PROTECT Control Signals)
    J3 D-C Power Supply
    J4 Frame Ground

 This separation of connectors by function relates to the recommended
 wiring method. The wiring for the control signals on J1 may be a
 single cable that is looped or "daisy-chained" from one drive to the
 next. The data and control signals on J2 plus the power and ground
 wires (J3 and J4), must be wired in a radial or "star" configuration
 directly from the controller to each drive.


 D-C Power
 ---------
 The power supply lines from the host to the drive consist of +12
 Volts d-c, +12 Volts Return, +5 Volts d-c, and +5 Volts Return. All
 power supply voltages necessary for the operation of the drive are
 supplied through J3.

 The ripple and voltage should be held within the values given in the
 specifications. Any excursion outside these tolerance will initiate a
 Power-Fail condition, which causes the heads to retract and the
 spindle to brake. When power returns within tolerance, the drive will
 reinitialize. (A momentary power glitch may require the drive to be
 deselected and reselected.)

 Power to operate both the electronics and the drive motors must be
 provided from an external source through connector J3 on the printed
 circuit board. Two separate supply voltages are required: +12 and
 +5 Volts. The motor receive their drive current from the 12-volt
 supply. The external supply must be able to maintain the d-c voltages
 and the ripple content within the tolerances under all conditiones of
 normal operation.


 J1  Control Signals
 -------------------
 Connector J1 is a two-sided card-edge plug with 34 golg-flashed
 contacts located 17 on each side, on 0.1" centers. The pins are
 numbered 1 through 34. The odd-numbered contacts are located on the
 side of the printed circuit board closer to the drive assembly (the
 side with most of components). The end contacts on each side are
 identified by numbers printed on the board. A polarzing-key slot is
 located between pins 4 and 6. A recommended mating ribbon connector
 is AMP part number 88373-3. It must be equipped with a polarizing key
 between pins 4 and 6.


 J2  Data Signals
 ----------------
 Connector J2 is a two-sided card-edge connector with 20 gold-flashed
 contacts located 10 on each side, on 0.1" centers. The pins are
 numbered 1 through 20. The odd-numbered contacts are located on the
 side of the printed circuit board closer to the drive assembly (the
 side with most of components). The end contacts on each side are
 identified by numbers printed on the board. A polarizing-key slot is
 located between pins 4 and 6. A recommended mating ribbon connector
 is AMP part number 88373-6.


 J3  D-C Power Supply
 --------------------
 Connector J3 is a male four-pin plug, AMP P/N 1-480426-0, mounted on
 a 6-inch pigtail attached to the printed circuit board. The pins are
 numbered 1 through 4. The recommended mating connector is AMP part
 number 1-480424-0 equipped with four part number 60617-4 pins.


 J4   Frame Ground
 -----------------
 The Frame Ground lug must be connected directly to ground to achieve
 the error rates given in the specification. Use a minimum size of #18
 AWG wire.
 The Frame Ground line between the host and the drive connects to
 ground lug J4 on the drive. To meet the error rate specified, it is
 important that this be connected to the main system grounding point.
 Connector J4 is a quick-connect lug terminal, AMP Faston part number
 61761-2. The recommended mating connector is AMP Faston part number
 62187-1. If the mating connector is not used, the ground lug is
 equipped with a soldering hole to accommodata up to #18 wire.


 J10  Termination Resistor Pack
 ------------------------------
 In multidrive systems where the control signal cables is daisy-
 chained from one drive to the next, it may be necessary to remove the
 terminating resistor from socket J10. The drive is shipped from the
 factory with the resistor pack installed.

 Leave the resistor pack in place for a single drive system or in the
 last drive on the control cable (farthest from the controller) in a
 multidrive system.



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                      F   E   A   T   U   R   E  S
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PTI      PT225/PT338/PT238R/PT357R  OEM MANUAL

 General
 -------
 The Peripheral Technology Inc. (TI) family of 3  inch Winchester disk
 drives provides high performance, reliability, and low cost in a
 standard-size pckage. These microWinchester drives offer OEM and VAR
 users state-of-the-art 40 millisecond access time, very low power
 requirements, the industry standard ST506/412 interface, and a choice
 of memory capacity in a small package, for easy incorporation into
 the newest generation of small desktop and portable computers, in-
 strumentation systems, and multiuser systems.

 The four models provide a choice of data storage: either two or three
 disks, and either standard "MFM" encoding or the greater data density
 of "RLL" encoding.

 In the design and development of these new drives, a fresh look was
 taken at solving major problem areas in existing products.
 Winchester drives typically require a tradeoff between speed and
 significant power demands, and are very susceptible to data loss and
 irrecoverable damage from the shock and vibration of normal handling.
 The speed/power tradeoff was not only overcome, but the innovative
 design resulted in a drive with access time about half that of
 previous microWinchester and a power consumption of less than six and
 a half watts. The problem of data loss from normal handling was
 eliminated by automatically retracting and looking the heads in a
 non-data landing zone. This system is completely passive during
 normal operation. It functions not only when the power is manually
 turned off but also if there is an external supply or an internal
 malfunction.

 The PTI drives now now make it possible to make a battery-operated
 portable unit that is power efficient, insensitive to operating
 position, and immune to normal handling problems.

 Features
 --------
 All PTI drives incorporate the following features, for superior
 performance and ease of use.

  - Proprietary system automatically moves heads away from the data
    area into a landing zone, where they are automatically locked,
    whenever power to the drive is removed.

  - Dynamic spindle braking action follows head locking, quickly
    stopping disks to minimize wear to head and medium.

  - Pulse-width modulation of motor drive current provides high
    efficiency, for reduced heat losses and longer component life.

  - Always-on buffered seek provides optimum head positioner velocity
    profile for faster access time.

  - Head-positioning servo always moves on the leading edge of first
    step pulse even through additional pulses are still being receiv-
    ed.

  - Embedded Track Zero provides increased reliability and greater
    precision with today's higher track desities.

  - Microprocessor-controlled Servo Calibration and Initialzation
    maintains continued accuracy and reliability.

  - Optical encoding in conjunction with position information embedded
    in each track precisely controls both position and velocity of
    read/write heads and hard disk.

  - Use of a brushless servo motor in conjunction with a rack and
    pinion drive provides efficent and precise head positioning.

  - Digital closed-loop servo drive system sharply reduces power
    demand to less than 6.5 watts.

  - Mechanical and electrical interfacing follows industry standards
    to cut system integration time and simplify special applications.

 Cooling
 -------
 The very low power requirement of the PTI drive eliminates the need
 for large internal heat sinks and external fans for the drive itself.
 By reducing the total heat dissipation of the system and reducing the
 drain on the host power supply, it will also reduce the need for a
 system cooling fan.

 Maintenance
 -----------
 No routine maintenance is necessary for PTI drives. There are no
 adjustments on the electronics circuit board, other than the config-
 uration procedure when used in a multidrive system. The mechanismus
 is sealed system and requires no additional lubrication.

 Repair
 ------
 If a drive is suspected of malfunctioning, substitute a known-good
 drive if possible. Verify that all control and data signals conform
 to the level and timing requirements given in this manual.

 PTI does not recommended making any repairs to the electronics
 printed circuit board, including complete substitution of another
 board. Any service to the HDA (Head/Disk Assembly) can only be done
 in a clean room environment, so the complete drive must be returned
 to PTI for service.

   ANY ATTEMPT TO OPEN THE SEALED ENCLOSURE WILL VOID THE WARRANTY.


 Reliability
 -----------
 MTBF:                   25,000 poh
 Preventive Maintenance: None
 MTTR:                   30 min
 Service Life:           5 years


