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Hard Drive: HEWLETT PACKARD: HP C2490A-001 2100MB 3.5"/HH SCSI2 FAST




H P   C 2 4 9 0 A - 0 0 1    HEWLETT PACKARD
NO MORE PRODUCED                                      Native|  Translation
                                                      ------+-----+-----+-----
Form                 3.5"/HH               Cylinders    2465|     |     |
Capacity form/unform  2100/      MB        Heads          18|     |     |
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

Layout

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

Jumpers

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.

Install

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.

Features

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.













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