
H P   9 7 5 6 0   T    HEWLETT PACKARD
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 5.25"/FH              Cylinders    1952|     |     |
Capacity form/unform  1355/      MB        Heads          19|     |     |
Seek time   / track  13.5/ 3.0 ms          Sector/track   72|     |     |
Controller           SCSI2 SINGLE-ENDED    Precompensation
Cache/Buffer           128 KB STATIC RAM   Landing Zone
Data transfer rate    2.875 MB/S int       Bytes/Sector      512
                     10.000 MB/S ext SYNC
Recording method     RLL 2/7                        operating  | non-operating
                                                  -------------+--------------
Supply voltage     5/12 V       Temperature *C           50    |    -40 65
Power: sleep              W     Humidity     %         8 80    |      5 80
       standby            W     Altitude    km    -0.061  3.048| -0.305 15.240
       idle          35.0 W     Shock        g         6       |     30
       seek          28.0 W     Rotation   RPM      4002
       read/write         W     Acoustic   dBA        40
       spin-up            W     ECC        Bit   144,REED SOLOMON
                                MTBF         h     150000
                                Warranty Month
Lift/Lock/Park     YES          Certificates     CSA,IEC950,TUV,UL1950,VDE    

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                        L   A   Y   O   U   T
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HEWLETT  HP 97556/58/60 SCSI  TECHNICAL REFERENCE MANUAL 5960-0115

  +---------------------------------------------------------+
  |                                                       1+|XXC
  |  SINGLE-ENDED                                         |||XXO
  |                                                       ++|XXN
  |                                           Terminator  1+|XXN
  |                                           Packs       |||XXE
  |                                                       ++|XXC
  |                                                       1+|XXT
  |                                                       |||XXO
  |                                                       ++1XXR
  |                                                ++++++++++
  |                                  Option Pinset 9++++++++1
  |                                                       +-+
  |                                                       | |
  |                                                       | |
  |                                                       +-1
  |                                                         |XX
  |                                                         |XX Power
  +---------------------------------------------------------+







  +---------------------------------------------------------+
  |                                                         |XXC
  | DIFFERENTIAL                                            |XXO
  |                                                         |XXN
  |                                                         |XXN
  |                                                         |XXE
  |                                                         |XXC
  |                                                         |XXT
  |                                                         |XXO
  |                                                         1XXR
  |                                                ++++++++++
  |                                  Option Pinset 9++++++++1
  |                                                       +-+
  |                                                       | |
  |                                                       | |
  |                                                       +-1
  |                                                         |XX
  |                                                         |XX Power
  +---------------------------------------------------------+



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HEWLETT  HP 97556/58/60 SCSI  TECHNICAL REFERENCE MANUAL 5960-0115

 Jumper Setting
 ==============



 END VIEW
 --------

 |                                         Write Protect         |
 |                                      Master+ |       Power    |
 |   SCSI Connector              1      Slave+| |     +-------+  |
 |+--XXXXXXXXXXXXXXXXXXXXXXXXXXXXX-----------++-+-421-+O O O O+-+|
 ||                                   Sync   oo o ooo +4-3-2-1+ ||
 ||                                   Spindleo  o ooo           ||
 |++                                         |    +++          ++|
 +-+                                        GND  SCSI ID       +-+


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


 SCSI Address Selection
 ----------------------
 The SCSI address for the drive is determined by the states (OPEN or
 CLOSED) of three pin-sets located nearest the power connector. The
 drive is shipped from the factory with shorting jumpers across all
 three pin-sets which sets up a SCSI Address of 7. Save any removed
 jumpers for future use.


   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          |  4    |   2   |   1   |
   +----------+-------+-------+-------+
   |    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|
   +----------+-------+-------+-------+


 Write Protect
 -------------
 The Write Protect pin-set is located between the Address pin-sets and
 the Synchronized Spindle pin-sets. When CLOSED the entire drive is
 forced into the Write Protect mode. When OPEN, the Write Protect
 function can be controlled with the Mode Select command.


 Synchronized Spindle
 --------------------
 There are four synchronized spindle modes: Stand Alone, Slave,
 Master, and Master Control. The HP 97556/58/60 SCSI disk drives
 supports all four modes.

 The power-on default for all drives is the Stand Alone mode. The
 Synchronized Spindle function is controlled with the RPL bits in
 parameter 04 (hex), byte 17 of the Mode Select command. In addition,
 byte 18 of the same Mode page provides for positional offset from the
 input sync signal.

 When the drive is in the Stand Alone mode:

  - It does not transmit a sync signal on the master line.
  - It does not receive an externally sourced slave sync input.

 When the drive is set to the Slave mode:

  - It does not transmit a sync signal.
  - It receives an externally sourced slave sync on the slave input
    line (or from the SCSI connector pin 29).

 When the drive is set to the Master mode:

  - It transmits a sync signal on both the master and slave lines
    (or from the SCSI connector pin 29).
  - It syncs internally to the same signal.

 When the drive is set to the Master Control mode:

  - It transmits a sync signal on the master line.
  - It receives an externally sourced sync on the slave line
    (or from the SCSI connector pin 29).


 Option Pin-Set Selections
 -------------------------
  +------------------------------------------------------------------+
  |Pin-Set/Status             Function                               |
  +------------------------------------------------------------------+
  |Pin-Set 1:   RESERVED MUST BE OPEN                                |
  +------------------------------------------------------------------+
  |Pin-Set 2:   Sync Spindle Signal Routing                          |
  |                                                                  |
  | 2 = CLOSED  Pin 29 of SCSI connector connected to ground.        |
  | 3 = OPEN    NOTE: when pin-set 3 is OPEN, pin-set 2 MUST be      |
  |             CLOSED to connect pin 29 to ground                   |
  |                                                                  |
  | 2 = OPEN    Synchronized spindle sync signal routed to pin 29 of |
  | 3 = CLOSED  SCSI connector. NOTE: when pin-set 3 is CLOSED, pin- |
  |             set 2 MUST be OPEN.                                  |
  +------------------------------------------------------------------+
  |Pin-Sets 4 and 5: +5V Source for On-Board Terminator Resistors    |
  |                                                                  |
  | 4 = OPEN    All Drives: Drive +5V not connected to terminators;  |
  | 5 = OPEN    initiator supplied +5V not connected to terminators. |
  |                                                                  |
  | 4 = CLOSED  All Drives: Drive +5V connected to on-board          |
  | 5 = OPEN    terminators but not to SCSI connector pins.          |
  |                                                                  |
  | 4 = OPEN    Single Ended Drives: Initiator supplies +5V input to |
  | 5 = CLOSED  SCSI connector pin 26.                               |
  |                                                                  |
  |             Differential Drives: Initiator supplies +5V input to |
  |             SCSI connector pins 25 and 26.                       |
  |                                                                  |
  | 4 = CLOSED  Single Ended Drives: Drive +5V connected to on-board |
  | 5 = CLOSED  terminators and to SCSI connector pin 26.            |
  |                                                                  |
  |             Differential Drives: Drive +5V supplied to on-board  |
  |             terminators and to SCSI connector pins 25 and 26.    |
  |                                                                  |
  | The standard Single-Ended drives are shipped with three          |
  | terminator resistor packs installed. The standard differential   |
  | drives are shipped with no terminator resistor packs installed.  |
  | When installing multiple drives on the SCSI channel, the packs   |
  | must be removed from all but the last drive in the chain. The    |
  | drives can be ordered from the factory with the packs removed.   |
  | When re-installing the packs, ensure that they are properly      |
  | keyed into their connectors.                                     |
  +------------------------------------------------------------------+
  |Pin-Set 6:   Unit Attention                                       |
  |                                                                  |
  | 6 = OPEN    Enable Unit Attention                                |
  |                                                                  |
  | 6 = CLOSED  Inhibit Unit Attention                               |
  +------------------------------------------------------------------+
  |Pin-Set 7:   Drive Initiation of SDTR Message                     |
  |                                                                  |
  | 7 = OPEN    Inhibit drive Initiation of SDTR message             |
  |                                                                  |
  | 7 = CLOSED  Enable drive Initiation of SDTR message at Power-On  |
  |             and Reset                                            |
  +------------------------------------------------------------------+
  |Pin-Set 8:   Parity                                               |
  |                                                                  |
  | 8 = OPEN    Inhibit parity checking                              |
  |                                                                  |
  | 8 = CLOSED  Enable parity checking                               |
  +------------------------------------------------------------------+
  |Pin-Set 9:   Auto Spin-Up                                         |
  |                                                                  |
  | 9 = OPEN    Drive will not spin up until Initiator sends Start   |
  |             Unit command                                         |
  |                                                                  |
  | 9 = CLOSED  Drive will spin up automatically at Power-On         |
  +------------------------------------------------------------------+


 Front Panel LED Indicator
 -------------------------
 The light emitting diode (LED) indicator on the front of the disk
 drive is an activity light that indicates the oerational status of
 the drive from power-on, through the self-test diagnostics, and into
 normal operation:

 1. ON   When the disk drive is switched on, the LED normally stays on
         during the power-on sequence. The LED stays on while the
         spindle motor is being started until it is up to speed. If
         the LED is does not go out, a catastrophic failure has
         occured. The most probable cause is a failure of the drive
         electronics/controller PCA.

 2. FLASHING
         A flashing LED (approximately 1 Hz) insicates that the
         controller has failed all or a portion of the internal
         diagnostic tests.

 3. INTERMITTENT
         After the power-on diagnostics have completed, the LED
         functions as an activity light and will go on any time the
         disk drive is executing a command, reading, or writing. If
         the LED is off, the drive is idle.



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HEWLETT  HP 97556/58/60 SCSI  TECHNICAL REFERENCE MANUAL 5960-0115

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

 Protection From Mechanical Shock
 --------------------------------
 The mechanism is attached to the mounting frame(s) by pliable shock
 mounts that isolate it from mechanical shock when properly installed.

 Before installation, the disk drive is susceptible to damage from
 excessive shock and vibration during shipping and handling. Dropping
 a drive almost always causes immediate damage, but setting a drive
 down too hard may shorten its operational life. The damage can be
 hidden, and can reduce the life of the drive, or cause unexplained
 failure to occur at a later date.


 Physical Mounting
 -----------------
 There are eight (8) threaded mounting holes (for 6/32 threads) on the
 disk drive: two on each side, and four on the bottom. Typically, the
 disk drive is fastened directly to a chassis with 6/32 screws. Use
 the following guidelines to mount the disk drive:

  - Use 6/32 screws and torque them to 10 inch-pounds.

  - When mounted, the hardware must not protude more than 1 mm (0.04
    inch) beyond the inside of the disk drive frame.


 Airflow Requirements
 --------------------
 The disk drive must be installed such that the ambient air
 temperature surrounding the disk drive is maintained within the
 limits.

 Airflow is required to maintain disk drive performance and
 reliability. The disk drive can be cooled by forced air or by natural
 cooling. Forced air may be necessary if the disk drive is located
 within a cabinet or other enclosure. If forced air cooling is not
 used, the disk drive must be located such that internal heat is
 conducted away from the drive and no outside heat sources raise the
 operating temperatures above the limits.


 Cable Requirements
 ------------------
 The disk drive adheres to the cabling requirements and limitations
 set forth in the ANSI SCSI specifications.

  - Cables with a characteristic impedance of 100 ohms  10% are
    recommended for unshielded flat or twisted pair ribbon cable.

  - Cables with a characteristic impedance of 90 ohms  10% are pre-
    ferred for shielded cables.

  - To minimize discontinuities and signal reflections, do not use
    cables with different impedances on the same bus.

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

  - Cables should be properly terminated.


 Recommended Mating Connectors
 -----------------------------
 EQUIVALENTS MAY BE USED.

 SCSI Connector (single-ended and differential) 3M 3425-6600

 DC Power                                       AMP 1-480424-0

 Frame Ground                                   AMP 62187-1

 Shorting jumpers for address, write protect,   AMP 531220-3
 and synchronized spindle pinsets               (manufacturer
                                                supplies rail of 10)
 Synchronized Spindle Connector                 AMP Housing 4-87456-9
                                                (*1)

 Shorting jumpers for option pinsets:

   2*1 shorting jumper:   Dupont 86730-001
   2*2 connector housing: Dupont 69307-004 (*2)
   2*3 connector housing: Dupont 69307-006 (*2)
   2*5 connector housing: Dupont 69307-010 (*2)

 Notes:

 1. Contact insert required; (For AWG 20-24 wire, use AMP 1-87309-4)

 2. Contact inserts required: (For AWG 26-30, use Dupont 77138-101;
    for AWG 32-36 wire, use Dupont 77139-101)


 SCSI Connector
 --------------
 The SCSI device connector is a nonshielded 50-pin connector consist-
 ing of two rows of 25 male pins with adjacent pins 2.54 mm (0.1 in.)
 apart. The physical construction and pin assignments for the
 connector conform to the SCSI specifications for single-ended and
 differential drive configurations.

 The SCSI cable connector should be a nonshielded 50-pin connector
 consisting of two rows of 25 female contacts with adjacent contacts
 2.54 mm (0.1 in.) apart. A shroud and header body should be used.


 Single-Ended Cable
 ------------------
 A 50-conductor flat cable or 25-signal twisted-pair cable should be
 used. Cable length should be equal to or less than 6.0 meters. This
 refers to internal and external cable length (except stubs).

 A stub length of no more than 0.1 meter is allowed off the main line
 interconnection within any connected device.


 Differential Cable
 ------------------
 A 50-conductor flat cable or 25-signal twisted-pair cable should be
 used. Cable length should be equal to or less than 25 meters. This
 refers to internal and external cable length (except stubs).

 A stub length of no more than 0.2 meter is allowed off the main line
 interconnection within any connected device.


 Power Distribution
 ------------------
 The +5 and +12 voltages provided by an external dc power supply are
 distributed to the spindle motor driver, actuator driver, analog
 amplifiers, and digital circuitry. A reset output alerts the other
 circuits when power-on occurs and when power is lost. Each circuit
 responds in a predefined manner to the reset condition.


 Look Ahead Reads
 ----------------
 The Look Ahead Read capability can improve the performance of a drive
 doing sequential READs by preloading the buffer with the data most
 likely to be requested with the next READ command. After a READ
 command is received by the controller, the drive seeks to the proper
 location and loads the requested data into the buffer. While that
 data is being transferred to the host, the Look Ahead Read function
 continues to read beyond track boundaries until the buffer is full.
 If, in following READ requests, the host asks for subsequent blocks,
 they will already be in the buffer, and the data will be returned to
 the host without the delay of a media access.

 If a new READ command requests data not contained in the buffer while
 the drive is performing a Look Ahead Read, the process is aborted,
 and the drive will immediately seek to the new location with minimal
 effect on access or transfer performance. Filling the buffer with
 unrequested data has a lower priority than delivering requested data.


 RAM Buffer
 ----------
 The RAM Buffer contains 128-kilobytes of static RAM. All data
 transferred between the host and the disk must pass through the RAM
 buffer. It is protected by an additional 2 bits of parity for each
 16-bit word transferred by the DMA.


 Synchronize Cache
 -----------------
 If a more recent logical block within the specified range exists in
 cache memory than on the physical medium, the Synchronize Cache
 command requests the target to write that logical block to the
 medium.



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                      F   E   A   T   U   R   E  S
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HEWLETT  HP 97556/58/60 SCSI  TECHNICAL REFERENCE MANUAL 5960-0115


 Product Description
 -------------------
 The HP 97556/58/60 SCSI single-ended and differential disk drives are
 reliable, low cost, high capacity, high performance, random access
 mass storage devices . Each product utilizes sputtered thin-film
 5.25-inch disks as storage media.

 The disk drive is orderable with or without a:

 - front bezel
 - front panel LED indicator
 - terminator resistor packs



 Seek Time
 ---------
       +-----------------------------------+--------+
       |Track-to-Track          msec. typ. |   3    |
       +-----------------------------------+--------+
       |Random Average          msec. typ. |  13.5  |
       +-----------------------------------+--------+
       |Maximum Seek (1962 cyl) msec. typ. |  25    |
       +-----------------------------------+--------+
       |Incremental Head Switch msec. typ. |   0.8  |
       +-----------------------------------+--------+
       |Latency (Average)       msec. avg. |   7.5  |
       +-----------------------------------+--------+


 Assembly Descriptions
 ---------------------
 The assemblies in the disk drive include the head/disk assembly (HDA)
 and the drive/electronics printed-circuit assemly (PCA). The sealed
 HDA contains the mechanical and electromechanical assemblies of the
 disk drive. The drive/electronics PCA provides all electronic control
 over the HDA.


 Head/Disk Assembly
 ------------------
 The head/disk assembly (HDA) contains disks, heads, an actuator
 assembly, head interface circuits, atmospheric controls, vibration
 isolators, and a spindle assembly. An aluminium casting provides the
 supporting structure for these parts. The entire assembly is sealed
 and is not field repairable.


 Disks
 -----
 The disks are 130 mm (5.1 inch) diameter aluminium substrate with a
 sputtered thin-film surface. The disks are mounted on the spindle
 assembly in stacks of six (97556), eight (97558), or ten (97560)
 disks. Data is stored on all surfaces of all disks except for the
 bottom surface of the bottom disk which is reservered for servo
 information.


 Heads
 -----
 Eleven (97556), fifteen (97558), or nineteen (97560) thin-film data
 heads in the HDA write and read user data. An additional head in each
 unit is used to recover the servo information from the bottom surface
 of the bottom disk.


 Actuator Assembly
 -----------------
 Mechanical positioning of the read/write heads is achieved using a
 rotary actuator. Actuator current is supplied by the actuator driver,
 which amplifies position information from the servo circuits. A
 shipping latch captures the heads at the inside diameter of the disks
 (away from user data) whenever power is removed from the disk drive.
 This prevents the actuator from moving until power is applied to the
 disk drive. At power-on, the servo processor releases the latch,
 allowing normal movements of the heads.


 Atmospheric Controls
 --------------------
 The atmospheric controls in the HDA consist of a breather system and
 a recirculating filter. The breather system equalizes air pressure
 within the HDA to ambient air pressure. A breather filter prevents
 contaminants from entering the HDA. A recirculating filter maintains
 a low particle count within the HDA.


 Vibration Isolators
 -------------------
 To protect the HDA from random external vibrations, it is mounted on
 vibration isolators.


 Spindle Assembly
 ----------------
 The spindle assembly provides the mechanical mounting for the disks.
 The spindle rotates on a ball bearing system and is driven by an
 "in-hub" brushless DC motor. The 3-phase drive current for the motor
 is provided by the spindle drive circuit on the drive/electronics
 PCA. Three Hall-effect sensors, mounted on the spindle assembly,
 provide feedback signals to the spindle control electronics for
 coarse speed and phase switching control.


 Defect List
 -----------
 The defect list consists of a 4-byte header followed by zero or more
 8-byte defect descriptors. Each descriptor consists of an 8-byte
 physical address or bytes from index address. Each address is bounds-
 checked by the Target. If any address is out of bounds, an ILLEGAL
 REQUEST Sense Key is generated, and the format operation is
 discontinued.


 Error Correction Code
 ---------------------
 The HP 97556/58/60 Series of disk drives use a Reed-Solomon error
 correction code (ECC) for detection and correction of data errors.
 During a write operation, the ECC function generates 18 bytes of ECC
 information, and writes the information into the ECC field as the
 sector is written. During a read operation, the controller generates
 an 18-byte code rom the data field being read, and compares it to the
 ECC field created during the write operation. If the 18-byte code
 differs from the ECC field, a data error is detected and the ECC
 field is used to correct the data.


