
H P   C 2 4 8 8 A - 0 0 1    HEWLETT PACKARD
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    2465|     |     |
Capacity form/unform  1600/      MB        Heads          15|     |     |
Seek time   / track   9.2/ 2.5 ms          Sector/track     |     |     |
Controller           SCSI2 SI/FAST         Precompensation
Cache/Buffer           256 KB SEGMENTED    Landing Zone
Data transfer rate    5.000 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 50    |    -40 65
Power: sleep              W     Humidity     %         8 80    |      5 90
       standby            W     Altitude    km    -0.305  3.048| -0.305 15.240
       idle               W     Shock        g        10       |     50
       seek          18.9 W     Rotation   RPM      6400
       read/write    18.0 W     Acoustic   dBA        39
       spin-up       38.0 W     ECC        Bit   144,REED SOLOMON
                                MTBF         h     500000
                                Warranty Month        60
Lift/Lock/Park     YES          Certificates     CSA,IEC950,TUV,UL1950,VDE


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HEWLETT  HP C2486A/88A/90A  TECHNICAL REFERENCE MANUAL 5961-4359

  +---------------------------------------------------------+
  |                                                     1-+ |XX
  |                                             Option  | | |XX
  |                                             Pin-Set | | |XX
  |                                                     | | |XX I
  |                                                     | | |XX N
  |                                                    16-+ |XX T
  |                                                         |XX E
  |                                                         |XX R
  |                                                         |XX F
  |                                                         |XX A
  |                                                         |XX C
  |                                                         |XX E
  |                                                         |X1
  |                                                         |
 ++LED                                                      |XX
 ++                                                         |XX Power
  +---------------------------------------------------------+  1



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                      J   U   M   P   E   R   S
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HEWLETT  HP C2486A/88A/90A  TECHNICAL REFERENCE MANUAL 5961-4359

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

 Option Pinset
 -------------

       Auto Spinup-------------+  +----------------------Key
            Parity----------+  |  |  +-------------------SCSI Pin 29
              SDTR-------+  |  |  |  |  +----------------Sync Spindle
    Unit Attention----+  |  |  |  |  |  |  +-------------Key
     Write Protect-+  |  |  |  |  |  |  |  |
                   |  |  |  |  |  |  |  |  |
         16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1
        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
        +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
         |  |   |                            |  |  |  |
         |  |   +-RESERVED                   |  |  |  +--Unit Select 1
         |  +-----Terminator Enable          |  |  +-----Unit Select 2
         +--------Terminator Power           |  +--------Unit Select 3
                                             +-----------RESERVED


 Unit Select
 -----------
 Rear pins: GND; Front Pins: Unit Select 1-2-3

   +----------+-----------------------+
   | SCSI ID  |        Jumpers        |
   |          |  3    |  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|
   +----------+-------+-------+-------+



 6 and 7 Sync Spindle
 --------------------
 6 Rear Pin: Sync Spindle; Front Pin: SCSI pin 29
 7 Rear Pin: SCSI pin 29; Front Pin: GND

 Note
 Pinsets 6 and 7 have no effect if Sync Spindle Mode is disabled.
 Refer to Mode Page 04H.

 6 OPEN   NOT ALLOWED
 7 OPEN

 6 CLOSED Connects Sync Spindle line to SCSI pin 29. When pinset 6 is
 7 OPEN   shorted, pinset 7 MUST be open. Rear pin of pinset 7 is
          sync output in Master mode, or sync input in Slave mode.

 6 OPEN   Connects pin 29 to ground. When pinset 6 is shorted, pinset
 7 CLOSED 7 MUST be open.

 6 CLOSED NOT ALLOWED
 7 CLOSED


 9  Auto Spin-up
 ---------------
 Rear Pin: Auto Spin-Up; Front Pin: GND

 9 OPEN   Drive will not spin up until Initiator sends Start Unit
          command
 9 CLOSED Drive will spin up automatically at Power-On


 10 Parity
 ---------
 Rear Pin: Parity; Front Pin: GND

 10 OPEN   Inhibit parity checking
 10 CLOSED Enable parity checking


 11 SDTR
 --------
 Rear Pin: SDTR; Front Pin: GND

 11 OPEN   Inhibit drive Initiation of SDTR message
 11 CLOSED Enable drive Initiation of SDTR message at Power-On and
           Reset.


 12 Unit Attention
 -----------------
 Rear pin: Unit Attention; Front Pin: GND

 12 OPEN   Enable Unit Attention
 12 CLOSED Inhibit Unit Attention


 13  Write Protect
 -----------------
 Front Pin: GND; Rear Pin: Write Protect

 OPEN   Drive looks at Mode Page Header and responds accordingly;
        default = NOT write protected
 CLOSED Drive is forced into the Write Protect mode


 14  Reserved
 ------------
 MUST BE OPEN!


 15 Terminator Enable
 --------------------
 Front Pin: GND; Rear Pin: Terminator Enable

 15 OPEN   On-board active terminators disabled. Terminators not
           connected to SCSI connector
 15 CLOSED On-board active terminators enabled and connected to SCSI
           bus. TermPwr source determined by placement of Terminator
           Power pinset jumper.


 16 Terminator Power
 -------------------
 Front Pin: SCSI pin 26; Rear Pin: TermPwr

 16 OPEN   TermPwr for on-board terminators provided by the drive
           only. Drive TermPwr is not connected to SCSI connector pin
           26.
 16 CLOSED TermPwr for on-board terminators provided by the drive, and
           drive TermPwr is connected to SCSI connector pin 26.


 Terminator Power Source Options
 -------------------------------
 The single-ended drive is shipped with active terminator integrated
 circuit installed. When installing multiple drives on the SCSI
 channel, the terminators must be disabled on all but the last drive
 in the chain. When the Terminator Enable jumper is installed, the
 terminators are disconnected from the SCSI connector.

 Active terminators should be powered by Terminator voltage (TermPwr)
 whenever the drive is connected to an active SCSI bus to avoid
 exceeding the bus high-state input current specification. The
 terminator Power jumper determines the TermPwr source as listed be-
 low.

 Note
 Terminator Enable jumper must be installed to connect the active
 terminators to the SCSI connector.



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                      I   N   S   T   A   L   L
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HEWLETT  HP C2486A/88A/90A  TECHNICAL REFERENCE MANUAL 5961-4359

 Notes on Installation
 =====================

 Screws
 ------
 Use 6/32 UNC screws with flat washers under the heads and torque
 them to 15 inch-pounds.

 When mounted, the hardware must not protrude more than 3 mm (0.12in.)
 beyond the inside of the disk drive mounting frame.

 Maintain a minimum clearance of 0.04 in. (1.0mm) between any system
 structure and any PCA component.

 Maintain a minimum clearance of 0.06 in. (1.5 mm) between any system
 structure and the top and all four sides of the disk drive. Insure
 that the system struture contacts only the drive mounting frames and
 clears the drive HDA.


 Operating Temperature Guidelines
 --------------------------------
 Ambient air temperature and airflow must be properly balanced to
 maintain drive performance and reliability.

 Operating Temperature Considerations
   The operating ambient air temperature specification is 5*C to 50*C
   (41*F to 122*F).

   Adjust the ambient air temperature to prevent the temperature at
   each location from exceeding the stated limit.

 Airflow Considerations
   The recommended air flow to maintain the component temperatures is
   3 to 5 CFM (cubic feet per minute) with most of the air flowing
   across the printed circuit board.


 Synchronized Spindle
 --------------------
 The C2080A/88A/90A disk drives supports the Stand Alone, Slave,
 Master modes, but not the Master Control mode. The power-on default
 for all drives is the Stand Alone Mode.

 When the drive is in the Stand Alone mode:

   It does not transmit a sync signal
   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 will sync to an externally slave sync signal

 When the drive is set to the Master mode:

   It transmit a sync signal on the sync pin
   It syncs internally to the same signal


 SCSI Connector
 --------------
 The SCSI device connector is a nonshielded 50-pin connector.


 Cabling 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 re-
   commended 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 termination power.

 - Cables must be properly terminated


 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.


 Mating Connector Requirements
 -----------------------------
 +--------------------------------------+----------------------------+
 |Connector/Function                    |Recommended Mating Connector|
 +--------------------------------------+----------------------------+
 |               Equivalents may be used                             |
 +--------------------------------------+----------------------------+
 |SCSI Connector (narrow: single-ended, |3M 3425-6600                |
 |differential)                         |                            |
 +--------------------------------------+----------------------------+
 |DC power                              |AMP 1-480424-0              |
 +--------------------------------------+----------------------------+
 |Sync. Spindle Connector               |AMP Housing 4-87456-9 *1    |
 +--------------------------------------+----------------------------+
 |Shorting jumpers for Option pin-sets  |                            |
 |(2.0 mm spacing)                      |                            |
 |           2x1 shorting jumper:       |Dupont 86730-001            |
 |                                      |(HP p/n 0360-2526)          |
 +--------------------------------------+----------------------------+
 Note *1
 Contacts insert required; refer to vendor documentation to select the
 proper contact set for the installed wire size.
 (For AWG 20-24 wire, use AMP 1-87309-4)


 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 disgital 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.


 Airflow Requirements
 --------------------
 Airflow is required to maintain disk drive performance and
 reliability. For best results, the drive should be operated as cool
 as possible. The mayority of the air should flow accross the PCA.
 This is a function of the specific airflow pattern inside the cabinet
 where the disk drive is installed.

 The airflow pattern around the drive should be adjusted to prevent
 the temperature measuring points on the HDA and the PCA from exceed-
 ing the maximum limits.



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                      F   E   A   T   U   R   E  S
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HEWLETT  HP C2486A/88A/90A  TECHNICAL REFERENCE MANUAL 5961-4359


 Product Description
 -------------------
 The HP C2486A/88A/90A SCSI single-ended disk drives are reliable, low
 cost, high capacity, high performance, random access mass storage
 devices. Each product utilizes sputtered thin-film 3.5-inch (95 mm)
 disks as storage media.


 Specials
 --------
 For customer needs that differ from the products described in this
 manual, Hewlett-Packard can provide specially modified products.
 These modifications are ordered, defines, engineered, and
 manufactured under "special" contract negotiations.


 Seek Times (including settling)
 -------------------------------
       +-----------------------------+--------+
       |Track-to-Track         msec. |   2.5  |
       +-----------------------------+--------+
       |Average   Reads        msec. |   8.75 |
       +-----------------------------+--------+
       |Average   Writes       msec. |   9.5  |
       +-----------------------------+--------+
       |Maximum Seek           msec. |  18.0  |
       +-----------------------------+--------+
       |Rotational Latency     msec. |   4.69 |
       +-----------------------------+--------+


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

 1. On
 At Power-On, the LED turns on until the Power-On sequence is complete
 and then turns off.

 If the Auto-SpinUp option jumper is installed, the Power-On sequence
 includes execution of the SpinUp sequence, calibrating the head
 positioning electronics, and testing the read/write system.

 If the Auto-SpinUp option is not installed, the Power-On sequence
 includes execution of the SpinUp sequence only.

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

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


 Sector Format
 -------------
 The smallest directly addressable storage area on a data surface is a
 sector. Accessing a sector is accomplished when the controller
 specifies the address of the cylinder, head, and sector.


 Error Correction Code
 ---------------------
 The 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 into the ECC field as the sector is written. During a
 read operation, the controller generates an 18-byte code from 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.


 RAM Buffer
 ----------
 The RAM Buffer contains 256-kilobytes of static RAM. All data trans-
 ferred between the host and the disk must pass through the RAM
 buffer.


 Disk Controller
 ---------------
 The disk controller coordinates the flow of data between the SCSI
 interface and the disk controller. It contains a DMA section which
 controls the transfer of data between the SCSI interface, the buffer
 RAM, and the disk controller. The DMA accesses the 256-kilobyte
 static RAM buffer to match the transfer speeds of the SCSI interface
 and the disk controller.

 The disk controller also performs error checking on data being
 transferred form the disk to the RAM buffer and generates ECC on data
 transferred from the RAM buffer to the disk. The data controller also
 does header verification during read/write operations.


 Spindle Motor Driver
 --------------------
 The spindle motor driver provides 3-phase current to start, drive,
 and control the speed of the in-hub spindle motor.

 Spindle motor current is controlled by switching circuitry that uses
 PWM (Pulse Width Modulation) technique to reduce +12-Volt power
 consumption during spin-up, and during subsequent operation.


