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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