
1 5 2 8   D    MICROPOLIS
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    2094|     |     |
Capacity form/unform  1342/ 1531 MB        Heads          15|     |     |
Seek time   / track  14.5/ 4.0 ms          Sector/track   83|     |     |
Controller           SCSI2 DIFFERENTIAL    Precompensation
Cache/Buffer           256 KB PARITY       Landing Zone
Data transfer rate    2.916 MB/S int       Bytes/Sector      512
                      4.800 MB/S ext SYNC
Recording method     RLL                            operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C        10 50    |    -40 65
Power: sleep              W     Humidity     %        10 90    |     10 90
       standby       21.0 W     Altitude    km    -0.061  3.048| -0.305 15.240
       idle               W     Shock        g         2       |     20
       seek               W     Rotation   RPM      3600
       read/write    24.0 W     Acoustic   dBA        41
       spin-up            W     ECC        Bit   48
                                MTBF         h     150000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates


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MICROPL. 1528  PRODUCT DESCRIPTION 105389 REV. A

   Single-Ended
  +---------------------------------------------------------++-+ J2
  |                                                  +-+W5  || |
  |                                                  +-+    || |ID 2
  |                                                  +-+W4  || |ID 1
  |                                                  +-+    |+-+ID 0
  |       COMPONENT SIDE                               +-+  |XX
  |                                                    | |  |XX
  |                                                  RN9 |  |XX J1
  |                                                    | |  |XX
  |                                                    | |  |XX
  |                                                    +-+  |XX
  |                                                  +----+ |XX
  |                                                  +----+ |XX
  |                                                  W1  W2 |XX
  |                                             +---+       |X1
  |                             Frame Ground    +---W11     |
  |                             Option      ++W28           |XX Power
  |                                         ++              |XX J3
  +---------------------------------------------------------+  1





   Differential
  +---------------------------------------------------------++-+ J2
  |                                                  +-+W5  || |
  |                                                  +-+    || |ID 2
  |                                                  +-+W4  || |ID 1
  |                                                  +-+    |+-+ID 0
  |       COMPONENT SIDE                               +-+  |XX
  |                                                    | |  |XX
  |                                                  RN9 |  |XX J1
  |                                                    +-+  |XX
  |                                                  +----+ |XX
  |                                                  +----+ |XX
  |                                                  W1  W2 |XX
  |                                                    +-+  |XX
  |                                                    | |  |XX
  |                                                 RN11 |  |X1
  |                                               W11-++-+  |
  |                                         ++W28   +-+     |XX Power
  |                                         ++              |XX J3
  +---------------------------------------------------------+  1






     +--------------------------------------+
     |       +--+J4 HDA Ground              |
     |       +--+                           |
     |                                      |
     |  +--+J5 Frame Ground                 |
     |  +--+                                |
     |   J2             J1           J3     |
     |.......... XXXXXXXXXXXXXXXXXX XXXXXXXX|
     +Multi--+++----Signal--------1--Power-1+
           ID210



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                      J   U   M   P   E   R   S
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MICROPL. 1528  PRODUCT DESCRIPTION 105389 REV. A

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

 x = factory default configuration


 Drive Option Selection
 ----------------------
 While the option jumpers may be positioned at locations different
 from the single-ended version of the Device Electronics board, the
 options supported are the same.

 If more than one drive is to be installed in a system, remove the
 interface terminator at RN9 (RN11) from each drive except the last
 one; and configure each drive to a different SCSI ID.


 J2  Device Addressing
 ---------------------
   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          | ID2   | ID1   | ID0   |
   +----------+-------+-------+-------+
   |x   0     | OPEN  | OPEN  | OPEN  |
   |    1     | OPEN  | OPEN  | CLOSED|
   |    2     | OPEN  | CLOSED| OPEN  |
   |    3     | OPEN  | CLOSED| CLOSED|
   |    4     | CLOSED| OPEN  | OPEN  |
   |    5     | CLOSED| OPEN  | CLOSED|
   |    6     | CLOSED| CLOSED| OPEN  |
   |    7     | CLOSED| CLOSED| CLOSED|
   +----------+-------+-------+-------+

 Up to eight devices (A host and seven targets) can be attached to
 the SCSI bus. The 1528-15 disk drive has three ID jumpers which are
 used to assign one of the eight SCSI ID bits (0 - 7) to the drive.

 In multiple-device systems, each drive must have its own unique ID.

 Interface Terminator pack RN9 (RN11) provides proper termination for
 the interface lines. For a multiple-drive system, the terminator
 pack is installed in the last drive on the cable.


 J2  Operator Panel Option
 -------------------------
 Multi-Function Connector/Jumper Block J2 is used to connect the
 drive to a user-supplied operator panel.

 J2 Pin 19  Logic ground

        20  Not used

        21  Write Protect Input. Logic Ground disables writing and
            lights the Write Protect LED.

        22  Ready output. Logic ground indicates that the drive is
            Ready and lights the Ready LED.

        23  +5V source for the LEDs.


 J4/J5  Ground Connection
 ------------------------
 3/16-inch spade lugs J4 and J5 are provided for grounding; system
 characteristics determine proper ground connection.


 W1/W2/W11  Bus Termination Power Option
 ---------------------------------------

   +-----------------------+------------------------------------+
   |        Jumpers        |                                    |
   |  W1   |  W2   |  W11  |                                    |
   +-------+-------+-------+------------------------------------+
  x| CLOSED| OPEN  | OPEN  |The drive provides terminator power |
   |       |       |       |to its on-board terminators         |
   +-------+-------+-------+------------------------------------+
   | OPEN  | CLOSED| OPEN  |Terminator power is provided by the |
   |       |       |       |host via interface cable J1, pin 26 |
   |       |       |       |(TERMPWR)                           |
   +-------+-------+-------+------------------------------------+
   | OPEN  | CLOSED| CLOSED|The drive provides terminator power |
   |       |       |       |to its on-board terminators and     |
   |       |       |       |also to the SCSI bus via interface  |
   |       |       |       |cable J1, pin 26 (TERMPWR)          |
   +-------+-------+-------+------------------------------------+
 A jumper is installed at W1, at W2, or at W2 and W11 to select the
 source of terminator power (+5V) for the SCSI Bus terminator packs
 on the Device Electronics board. Do NOT install jumpers at both W1
 and W11.


 W4  Bus Parity Check Option
 ---------------------------
     CLOSED  The drive neither generates nor detects parity.
  x  OPEN    The drive generates parity and enables parity detection.


 W5  Spindle Control Option
 ---------------------------
     CLOSED  The drive must wait for an interface START UNIT command
             to start the spindle motor.
  x  OPEN    The drive automatically starts the spindle motor at
             power-on.


 W28 Frame Ground Option
 ------------------------
     CLOSED  Frame Ground is connected to logic ground
  x  OPEN    Frame Ground is not connected to logic ground



 J3   DC Power and pin connector assignments
 -------------------------------------------
 -------------------+
 --+  +-----J3-----+|  pin 1    +12 VDC
  1|  | 4  3  2  1 ||  pin 2    +12 Volts Return
  -+  +------------+|  pin 3    + 5 Volts Return
  ------------------+  pin 4    + 5 VDC



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MICROPL. 1528  PRODUCT DESCRIPTION 105389 REV. A

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

 Recomended Drive mounting
 -------------------------

     horizontally             vertically
   +-----------------+   +--+             +--+ +------------------+
   |                 |   |  +-----+ +-----+  | |                  | x
   |                 |   |  |     | |     |  | x+----------------+x
 +-+-----------------+-+ |  |     | |     |  | ||x              x||
 +---------------------+ |  |     | |     |  | ||  x          x  ||
                         |  |     | |     |  | ||    x      x    ||
      x           x      |  |     | |     |  | ||      x  x      ||
 +------x------x-------+ |  +-----+ +-----+  | ||       xx       ||
 +-+------x--x-------+-+ +--+             +--+ ||     x    x     ||
   |       xx        |                         ||   x        x   ||
   |     x    x      |                         || x            x ||
   +---x--------x----+                         |x                x|
     x            x                           x++----------------++x


 Dimensions and Mounting
 -----------------------
 The 1528-15 drive uses industry-standard mounting for 5 -inch full-
 height Winchester disk drives.

 Recommended orientation is vertical on either side, or horizontal
 with the Device Electronics board down; other mounting orientations
 may be used provided the ambient air temperature around the drive is
 kept at or below 50*C (122*F).

 The term "ambient" becomes imprecise when referencing a drive in a
 system, since it is difficult to determine where the air temperature
 should be measured. To help resolve this confusion, Micropolis
 specifies that the maximum HDA casting temperature (regardless of the
 air temperature around the drive) is 60*C (140*F). Not exceeding this
 temperature will ensure that the head-to-media interface never exceed
 its temperature limit.

 Inasmuch as the drive frame acts as a heat sink to dissipate heat
 from the unit, the enclosure and mounting structure should be
 designed to allow natural convection of heat around the HDA and outer
 frame. If the enclosure is small or natural convetion is limited,
 a fan may be required.


 Mounting Screws
 ---------------
 2 per side 6-32 UNC-2B
 4 on bottom 6-32 UNC-2B

 CAUTION: The mounting screws must be selected so that they do not
 penetrate the bottom mounting holes by more than 0.20 inches or the
 side mounting holes by more than 0.156 inches. Screws that are too
 long will short to PCBA components and/or prevent proper operation of
 the shock mount system.


 Signal Connector J1
 -------------------
 J1 is a 50-pin connector on the Device Electronics board. Signal
 interface connection is made via this connector. The signals on J1
 include the 8-bit SCSI bus and various control and handshaking lines.

 Recommended Cable: 3M Scotchflex 3365/50 or equivalent
 Mating Connector:  3M P/N 3425-3000 or equivalent


 Multi-Function Connector J2
 ---------------------------
 J2 is a 24-pin connector on the Device Electronics board and is used
 for connecting the drive to a user-supplied Operator Panel.


 DC Power Connector J3
 ---------------------
 J3 is a 4-pin, keyed AMP MATE-N-LOK Connector on the Motor Control
 Board. Both +5V and +12V is supplied to the drive via this connector.

 Mating Connector: AMP 1-480424-0
             Pins: AMP 350078-4

 Suggested Wire Size: 18 AWG


 Ground Connectors J4/J5
 -----------------------
 3/16-inch spade lugs J4 and J5 are provided for grounding. System
 characteristics determine the proper ground connection.

 Mating Connector: AMP 60972-2 or equivalent.


 Multiple-Drive Systems
 ----------------------
 Up to seven 1528-15 drives can be connected to a single host.

                                             Drive #1
  +------HOST------+                 +-----------------+
  | +-----------+  +--o-SCSI-BUS-----+ J1              |
  | |Terminators|  |  |       +------+ J3    J4        |
  | +-----------+  |  |       |      +--------+--------+
  |                |  |       |               +------------------+
  +----------------+  |       |              Drive #2            |
                      |       |      +-----------------+         |
                      o-------+------+ J1              |         |
                      |       o------+ J3    J4        |         |
                      |       |      +--------+--------+         |
                      |       |               +------------------o
                      |       |              Drive #3            |
                      |       |      +-----------------+         |
                      o-------+------+ J1              |         |
                      |       o------+ J3    J4        |         |
                      |       |      +--------+--------+         |
                      |       |               +------------------o
                      |       |              Drive #4            |
                      |       |      +--------------+--+         |
                      +-------+------+ J1           |T |         |
                              o------+ J3    J4     +--+         |
           ---DC-VOLTAGES-----+      +--------+--------+         |
           ---GROUND--------------------------o------------------+

 T = TERMINATORS

 Interface Terminators are installed ONLY in the last physical drive
 in the control chain.

 Connectors J4 and J5 are provided for grounding; system
 characteristics determine the proper ground connection.


 Interface Electrical Characteristics (Single-ended)
 ---------------------------------------------------
 Interface control and status signals are digital (open collector TTL)
 utilizing industry-standard transmitters and receivers which provide
 a terminated, single-ended system.

 The assigned signals are terminated with 220 ohms to +5V (nominal)
 and 330 ohms to ground at each end of the cable. All signals use
 open-collector or three-state drivers.

 Single-ended drivers and receivers allow a maximum cable length of
 six meters (primarily for connection within a cabinet).

 Signal transmission requires a single 50-conductor cable. A
 characteristic impedance of 100 ( 10%) ohms is recommended for un-
 shielded flat or twisted-pair ribbon cable.

   a. Input Characteristics
      Each of the drive's signal receivers has the following
      characteristics when measured at the interface connector.

      1)  Signal true = 0.0 VDC to 0.8 VDC
      2)  Maximum total input load = -0.4 milliamps at 0.5 VDC
      3)  Signal false = 2.0 VDC to 5.25 VDC
      4)  Minimum input hysteresis = 0.2 VDC

   b. Output Characteristics
      Each signal driven by an SCSI device has the following
      characteristics when measured at the interface connector.

      1)  Signal assertion = 0.0 VDC to 0.5 VDC
      2)  Minimum driver output capability = 48 milliamps (sinking) at
          0.5 VDC.
      3)  Signal negation = 2.5 VDC to 5.25 VDC

   c. Terminator Power (TERMPWR at Pin 26)
      Terminator Power has the following requirements:

      V(TERM) = 4.25 VDC to 5.25 VDC

      800 milliamps minimum source drive capability with 1.0 amp
      recommended current limiting (e.g., a fuse).

      1.0-milliamp maximum bus loading (except for the purposes of
      providing power to an internal terminator).

 The 1528-15 disk drive provides keyed connectors to prevent
 accidental grounding or misconnection of terminator power.


 Interface Electrical Characteristics (Differential)
 ---------------------------------------------------
 Differential drivers and receivers allow a maximum cable length of
 25 meters. Differential interface signals consist of two signal lines
 denoted +SIGNAL and -SIGNAL.

 A signal is defined as true when the +SIGNAL is more positive than
 the -SIGNAL.

 A signal is defined as false when the -SIGNAL is more positive than
 the +SIGNAL.

 - Signal transmission requires a single 50-conductor cable.
 - A characteristic impedance of 100 ( 10%) ohms is recommended for
   unshielded twisted-pair ribbon cable.

 - A minimum conductor size of 28 AWG should be employed to minimize
   noise effects and ensure proper distribution of optional
   terminator power.

 A stub length of no more than 0.2 meters is allowed off the main-line
 interconnection within any connected equipment.

   a. Input Characteristics
      Each of the drives signal receivers has the following
      characteristics when measured at the interface connector.

      I(I) (input current on either input) =  2.0 milliamps, maximum

      Note: These characteristics include both receivers and passive
            drivers.

 This requirement is met with the input voltage varying between -7V
 and +12V, with power either on or off, and with hysteresis equaling
 35 millivolts, minimum.

   b. Output Characteristics
      Each driven signal has the following characteristics when
      measured at the interface connector.

      VOL  (low-level output voltage) = 1.7 V max at IOL
           where IOL = 55 milliamps

      VOH  (high-level output voltage) = 2.7 V max at IOH
           where IOH = -55 milliamps

      VOD  (differential voltage) = 1.0 V minimum, with commonmode
           voltages ranges from -7 to +12

      VOL and VOH are measured between the output terminal and the
      SCSI device's logic ground reference.


   c. Terminator Power (TERMPWR at Pin 25 and 26)
      Terminator Power has the following requirements:

      V(TERM) = 4.0 VDC to 5.25 VDC

      600 milliamps minimum source drive capability with 1.0 amp
      recommended current limiting (e.g., a fuse).

      1.0 milliamp maximum bus loading (except for the purposes of
      providing power to an internal terminator).

 The 1528-15D disk drive provides keyed connectors to prevent
 accidental grounding or misconnection of terminator power.


 Adjustments and Maintenance
 ---------------------------
 The 1528-15 disk drive requires no adjustments or periodic
 maintenance. Additionally, no mechanical adjustments are required to
 prepare the drives for handling or shipment.


 Field-Replaceable Components
 ----------------------------
 The concept of repair by replacement of complete functional
 components is utilized in the 1525-15, resulting in an MTTR of
 less than 15 minutes.



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                      F   E   A   T   U   R   E  S
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MICROPL. 1528  PRODUCT DESCRIPTION 105389 REV. A

 1528-15 Specifications
 ----------------------
 Micropolis 1528-15 (single-ended) and 1528-15D (differential) high-
 performance, 5 -inch, full-heigth Rigid Disk Drives provide OEMs with
 random-access, high-speed data storage and meet the needs of diverse
 applications environments.

 These drives are compatible with the "ANSI CCS" and "SCSI-2" versions
 of the industry-standard Small Computer System Interface (SCSI)
 specification.


 Seek Time
 ---------

                                          | 1528   |
        ----------------------------------+--------+
        Track-to-Track         msec. typ. |   4    |
                       Average msec. typ. |  14.5  |
                       Maximum msec.      |  32.25 |
        One-Third Stroke       msec. max. |  15.5  |
        Latency                msec. avg. |   8.33 |
        ----------------------------------+--------+



 Formatted Capacity Calculation
 ------------------------------
 The formatted capacity of the 1528-15 disk drive depends upon a
 a number of userselectable variables. One critical variable is
 sparing, either track-oriented or cylinder-oriented.

 The following formula is used to calculate the formatted capacity (C)
 of the 1528-15 drive using cylinder-oriented sparing:

 C = [(SPT x HDS) - (SPARE_SPC)] x (2106 - 3 - SPARE_CYL) x (BYTES)

 where SPT is the number of physical sectors per track.

 HDS is the number of data heads.

 SPARE_SPC is the number of spare sectors per cylinder. This variable
 is user programmable. A typical value for the 1528-15 drive is 8.

 2106 is the number of physical cylinders.

 3 cylinders are used by the drive and are not user accessible.

 SPARE_CYL is the number of spare cylinders. This variable is user
 programmable; a typical value for sparing is 3.

 BYTES is the bytes per sector (e.g., 1024, 512, etc.)


 Media Defects
 -------------
 Media defects are physical characteristics of the media which result
 in repetitive read errors when a functional drive is operated within
 specified operating conditions.

 At the time of manufacture, a media test system evaluates every drive
 and identifies each media defect location. The defects are logged on
 a label affixed to the drive.

 The defective areas are identified by Head address (HD), Cylinder
 address (CYL), and number of Bytes from Index (BFI). A printed list
 of the defects is also shipped with each drive.

 The list of manufacturer-found defects is stored on the drive in a
 reserved, write-protected area accessible by the SCSI controller.
 This list is known as the MDL (Manufacturers Defect List) or PList
 (Primary Defect List).

 The entries is contains can be mapped out (reassigned) automatically
 during the operation by appropriate use of the format control
 parameter bit.

     +------------------------------------------------------------+
     | Micropolis specifies that all 1528-15 drives shall have no |
     | more than one defect per megabyte of unformatted capacity. |
     +------------------------------------------------------------+


 Adjustments and Maintenance
 ---------------------------
 The 1528-15 disk drive requires no adjustments or periodic mainten-
 ance; aditionally, no mechanical adjustments are required to prepare
 a system for handling or shipment.


 Field-Repalceable Components
 ----------------------------
 The concept of repair by replacement of complete functional
 components is utilized in the 1528-15, resulting in an MTTR of less
 than 15 minutes.


 Air Filtration System
 ---------------------
 The 1528-15 drives are designed to provide contamination control
 within the sealed Head/Disk Assembly (HDA) throughout the life of the
 drive with zero maintenance.

 Air within the HDA is continuously recirculated and filtered through
 a high efficiency filter. Air is ducted to and from the filter for
 maximum pressure recovery and filter efficiency. Air within the HDA
 may only enter the drive through a high-efficiency breather filter.


 Data Transfers
 --------------
 1528-15 drives are capable of transferring data at 4.8 MBytes/sec. in
 synchronous mode and 1.8 MBytes/sec in asynchronous mode. In some
 configurations (e.g., short cable and fast host), the 1528-15 can
 achieve faster asynchronous transfer rates.


 Read-Ahead
 ----------
 The read-ahead function causes the 1528-15 drive to transfer the
 requested block into its buffer and continue to read sequential
 blocks until the buffer is filled or another command is received.

 On subsequent request for data, the buffer will be checked for the
 requested blocks. If the data already resides in the buffer, it will
 be transferred to the host and no media access will be necessary.
 This results in a significant improvement in performance.


 Through Parity
 --------------
 Data integrity is maintained in the 1528-15 drive by maintaining
 parity from the SCSI interface, through the drive's buffer, to just
 before the point where the data byte is converted to serial form
 for transmission to the media.


 N-Segment Data Buffer/Cache
 ---------------------------
 The 256K data buffer is dynamically divided into segments with each
 segment holding data from different areas of the disk. This maximizes
 the improvement of read-ahead technology by greatly increasing the
 probability of a cache hit.

 This feature improves the performance of all types of system; from
 single threaded DOS environments to complex architectures like UNIX
 with its own system caches.


