Metropoli BBS - dvas2.spc

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Updated April 22, 1996
________________________________________________________________________

Model DVAS-2810 IBM Hard Disk Drive
________________________________________________________________________
http:\\www.storage.ibm.com\storage\techsup\hddtech\hddtech.htm

This 2.5" SCSI hard disk drive provides 810 MB in a slim 17 mm high
package. Performance is enhanced by ECC on the fly and by a 64 K
segmented buffer with write-cache and read look ahead. Using MR head
technology IBM provides a high performance and high capacity drive for
the mobile computing market.

Product description
-------------------

Features

* Closed-loop actuator servo (Embedded sector servo)
* Integrated controller
* Multi-zone recording
* 1:1 interleave
* Enhanced ECC on the fly
- 128 bit Reed Solomon code operation 10 bit symbol
- Multi burst on the fly correction
* Automatic retry on errors
* Self-diagnostics in power up
* Rotary voice coil motor actuator
* 1,7 run-length limited (RLL) code
* Automatic actuator lock
* Dedicated head landing zone
* No preventive maintenance required

Configuration

Interface Fast SCSI-2
Formated device capacity 810 MB *1
Sector size 512 Bytes
Recording zones 8
User cylinders 2788
Data heads 6
Disks 3
Areal density average 493 Mb/sq.in.
Recording density (max) 93100 BPI
Track density 5300 TPI

Performance

Rotational speed 3800 RPM
Media transfer rate (8 zones) 24.9 - 36.0 Mbits/sec
Data buffer Read 32 KB/Write 32 KB
Interface transfer rate (max) 10.0 MB/sec
Latency average 7.9 msec
Seek time (typical)
Average (read) 14 msec
Track to track 4.0 msec
Full track 23 msec
Spin up (typical) 4.2 sec

Power

Requirements +5 VDC +/-5% *2
Power supply ripple (0-20 Mhz max) 100 mV p-p *3
Dissipation (typical)
Idle 1.2 Watts 0.24 A RMS
Read/Write 2.8 Watts 0.56 A RMS
Seek 2.0 Watts 0.56 A RMS *4
Standby 0.4 Watts 0.08 A RMS
Start up (average to ready) 0.70 A RMS
Start up (maximum peak) 4.7 Watts 0.94 A RMS *5
Supply rise time 7 - 100 msec

Physical size

Height 17 mm
Width 70 mm
Depth 100 mm
Weight 180 g

Environmental characteristics

Altitude
Operating -300 to 3000 m
Ship / store -300 to 12000 m

Temperature *6
Operating 5 to 55 C
Storage 0 to 65 C
Shipping -40 to 65 C
Temperature gradient (max) 20 C / hour
(Operating, storage or shipping)

Operating
Ambient temperature 5 to 55 C
Relative humidity (non-condensing) 8% to 90%
Maximum wet bulb (non-condensing) 29.4 C
Shock *7 (half-sine wave) 20 G / 3 msec
Vibration random (RMS) 0.67 G (5-500 Hz)

Non-Operating
Ambient temperature -40 to 65 C
Relative humidity (non-condensing) 5% to 95%
Maximum wet bulb (non-condensing) 40 C
Shock *8 (half-sine wave) 250 G / 2 msec
Vibration random (RMS) 1.04 G (2-200 Hz)

* Notes:

1) 1 MB = 1000000 bytes
2) The drive shall not incur damage for an over voltage condition of
+25% (maximum duration of 20ms) on the 5 V nominal supply.
3) The maximum supply ripple is measured at the 5 V input on the drive.
4) The seek average current is specified based on ten operations per
second.
5) The worst case operating current includes motor surge.
6) The system is responsible for providing sufficient air movement to
keep the surface temperature, measured at the center of the drive's
top cover, below 60 C.
7) The drive will withstand, with no hard error, a 20 G half-sine wave
shock pulse for a 12 ms duration. The drive will experience no data
loss or permanent damage during idle, seek or read modes when
experiencing no more than a shock pulse of 60 G half-sine wave for a
3.5 ms duration.
8) The drive will withstand, with no permanent damage or degradation in
performance, a 120 G half-sine wave shock pulse of 11 ms duration or
250 G for 2 ms.

Jumpers and configuration
-------------------------

Jumpers

The drive recognizes its device address, namely SCSI ID, with the
condition of -ID1, -ID2 and -ID4. The signal condition and the device
address are shown below.

┌───────────────────────────────────────────────┐
│ │
│ ┌─────────────(J1)──────────────┐ ┌─(J2)─┐ │
├─┴───────────────────────────────┴────┴──────┴─┤
│ . . . . . . . . . . │
│ . . . . . . . . . . │
└───────────────────────────────────────────────┘
pin 39 37. . . . . . . . . . . . . 3 1 7 5 3 1
40 38 8 6 4 2

40 pin SCSI Connector

-ID1 -ID2 -ID4 Device
J2 Pin #'s 5 6 7 Address</b>
open open open 0
GND open open 1
open GND open 2
GND GND open 3
open open GND 4
GND open GND 5
open GND GND 6
GND GND GND 7

Signal termination

The drive does not have termination or pull up resistors.

Configuration

Physical Layout DVAS-2810

Bytes per Block 512
Formated Capacity 810 MB
Number of Blocks 1,583,568

Electrical interface specifications
-----------------------------------

Connector

The SCSI signal connector is designed to mate with AMP part number
6-176135 or equivalent. Size and location of the mounting holes comply
with MCC.

40 pin SCSI Connector

Cabling

The maximum cable length from the host system to the drive is limited to
6 inches with external 1 K-ohm pull up resistors.

The cable length can be extended if the appropriate termination
resistors are attached to the interface lines. The maximum cable length
is determined by the electrical parameters of the interface.

Driver/receiver

The drive supports single ended drivers and receivers.

Signal definitions

The J1 pin assignments for interface signals:

_______________________________________

Pin Signal name Pin Signal name
_______________________________________
01 +5V 02 +5V
_______________________________________
03 RET 04 RET
_______________________________________
05 GND 06 DB0
_______________________________________
07 GND 08 DB1
_______________________________________
09 GND 10 DB2
_______________________________________
11 GND 12 DB3
_______________________________________
13 GND 14 DB4
_______________________________________
15 GND 16 DB5
_______________________________________
17 KEY 18 DB6
_______________________________________
19 GND 20 DB7
_______________________________________
21 GND 22 PARITY
_______________________________________
23 GND 24 TERM PWR
_______________________________________
25 -ATTN 26 -BSY
_______________________________________
27 GND 28 -ACK
_______________________________________
29 -RST 30 -MSG
_______________________________________
31 GND 32 -SEL
_______________________________________
33 -I/O 34 -C/D
_______________________________________
35 GND 36 -REQ
_______________________________________
37 RET 38 RET
_______________________________________
39 +5V 40 +5V
_______________________________________

The J2 pin assignments:

_______________________________________
Pin Signal name Pin Signal name
_______________________________________
1 (Unused) 2 -No Spin Up
_______________________________________
3 -INDEX 4 (Unused)
_______________________________________
5 -ID1 6 -ID2
_______________________________________
7 -ID4 8 -LED
_______________________________________

Note: If pin 2 is grounded the drive will not spin up at power on. The
drive must be started with a start unit command.

Signal line descriptions

BSY
BUSY indicates that the bus is in use

SEL
SELECT is used by an Initiator to select a Target or by a Target to
re-select an Initiator

C/D
CONTROL DATA indicates whether control (1) or data (0) information is on
the bus

I/O
INPUT/OUTPUT indicates whether the data on the bus is an input (1) to
the Initiator or an output (0) to the Target. This line is also used to
differentiate between SELECTION phase (0) and RE-SELECTION phase (1)

MSG
MESSAGE is driven by Target and indicates a message phase

REQ
REQUEST is driven by Target and indicates a request for a REQ/ACK data
transfer handshake

ACK
ACKNOWLEDGE is driven by the Initiator and indicates an acknowledgement
of a REQ/ACK data transfer handshake

ATN
ATTENTION is driven by an Initiator to inform a Target that the
Initiator has a message ready

RST
RESET clears all SCSI devices from the bus and resets them

Note: The target will not drive this line

DB(n)
8 data bits are used to transfer data over the bus. DB(7) is the most
significant

DB(P)
PARITY bit associated with DB(7-0). Data parity is odd

ID(n)
These signal pins are used to set the drive address

INDEX
The signal is just for reference, and the function is not specified

LED
The signal is just for reference, and the function is not specified

Mode select options
-------------------

Certain parameters are alterable using the SCSI 'Mode Select' command.
This allows certain drive characteristics to be modified to optimize
performance on a particular system. Refer to the DVAS-2XXX
Functional Specification for a detailed definition of the Mode Select
parameters.

The changeable parameters are:

Page 0 - Vendor unique parameters
UAI - Unit attention inhibit (0)
DSN - Disable target initiated (0)
DPC - Disable parity checking (0)

Page 1 - Read-write error recovery parameters
TB - Transfer block (0)
PER - Post Error (0)
DTE - Disable transfer on error (0)
DCR - Disable correction (0)
Read Retry count (01)
Write Retry count (01)

Page 2 - Disconnect/reconnect control parameters
Read buffer full ratio (30h)
Write buffer empty ratio (30h)

Page 8 - Caching parameters
RCD - Read cache disable (0)

Page 0D - Power condition
Standby (1)
Standby timer (1A5E0h{3hrs}

Page 38 - Standby timer parameters
Auto standby time (B4h{3 hrs}

Note: Default parameters are shown in closed brackets (X)

Operating modes
---------------

Spin-up

This power on mode is defined as the period of time from receipt of
power at the drive assembly or receipt of Start SCSI command to Idle
mode (or 'Ready' state).

Idle

In this mode the disks are spinning at rated speed, the drive is able
to accept and immediately execute commands requiring disk access. The
actuator assembly is located on track in the 'Ready' state.

Standby

The spindle motor is stopped. All of the drive's electronic circuits
are in a reduced power state except for the bus interface circuits.
Commands can be received immediately. The drive is in an interrupt
waiting mode.

Seek/read/write

This is a command execution mode where the drive's actuator is moving
or data is being written to or read from the media.

Note: After power down or spindle stopped, a head locking mechanism
secures the heads in the landing zone.

Mechanical data
---------------

Dimensions

Height 17.0 +0.35/-0.3 mm
Width 70.0 +/-0.25 mm
Length 100.0 +/-0.25 mm
Weight (max) 180 g

Mounting orientation

The drive will operate in all axes (6 directions). The drive will
operate within the specified error rates when tilted +/-5 degrees
from these positions.

Performance and error rate will stay within specification limits if the
drive is operated in the other permissible orientations from which it
was formatted. Thus a drive formatted in a horizontal orientation will
be able to run vertically and vice versa.

The recommended mounting screw torque is 3 +/-0.5 kgf. cm.

The recommended mounting screw depth is 3.5 +/-0.5 mm for bottom and
5.0 +/-0.5 mm for horizontal mounting.

The system is responsible for mounting the drive securely enough to
prevent excessive motion or vibration of the drive at seek operation
or spindle rotation, using appropriate screws or equivalent mounting
hardware.

Vibration tests and/or shock tests should be conducted with the drive
mounted to the table using the bottom four screws.

|...............100 +/-0.25.....................|
┌───────────────────────────────────────────────┐───
┌┴┐ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │70 +/-0.25
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
│ │ │ .
└┬┘ o o o ─┼─────┐
__└───────────────────────────────────────────────┘─── │
17mm___\______________________________________________\ (4X) M3

│-34.93 +/-0.4|----38.1 +/-0.25---|
├┬┬─────────┬───┬───────────────┬───┬──────────┐─────
├┤│ │ o │ │ o │ │ .
├┤│ └───┘ └───┘ │ .
├┤│ │ .
├┤│ │ .
├┤│ │ .
├┤│ ____ │ .
├┤│ / \ │ .
Front ├┤│ / \ │ . Back
├┤│ | | │ .
├┤│ \____/ │139.7 +/-0.5
├┤│ │ .
├┤│ │ .
├┤│ │ .
├┤│ │ .
├┤│ │ .
├┤│ │ .
├┤│ ┌───┐ ┌───┐ │ .
├┤│ │ o │ │ o │ │ .
└┴┴─────────┴─┼─┴─────────────────┴───┴────────┘─────
└─(4X) M3

The maximum allowable penetration of the mounting screw is 3.5mm.

Read this
=========

The technical information contained on this site is not a subsitute
for the full product specification, which should be used when more
detailed information is required.

This product overview represents IBM's design objectives and is
provided for comparative purposes; actual results may vary depending
on a variety of factors. The data contained within this product
overview does not constitute a warranty. Questions regarding IBM's
warranty terms or methodology used to derive this data should be
referred to your IBM representative.

Data subject to change without notice.

Electromagnetic compatability

This drive meets the following EMC requirements when installed in the
user system and exercised with a random accessing routine at maximum
data rate:

* United States Federal Communication Commission (FCC) Rules and
Regulations Part 15, Subject J-Computer Devices "Class B Limits".

* European Economic Community (EEC) directive #76/889 related to
the control of radio frequency interference and the Verband
Deutscher Elektrotechniker (VDE) requirements of Germany (GOP).

Warning

This disk drive can be damaged by Electro-Static Discharge (ESD),
please follow recommended ESD procedures before unpacking or handling
the drive.

Packaging

The drive must be protected against Electro-Static Discharge (ESD)
especially when being handled. The safest way to avoid damage is to
put the drive in an anti-static bag before ESD wrist straps etc. are
removed.

Drives should only be shipped in approved containers, severe damage
can be caused to the drive if the packaging does not adequately
protect against the shock levels induced when a box is dropped.
Consult your IBM marketing representative if you do not have an
approved shipping container.

Trademarks

IBM, AT and No-ID are trademarks or registered trademarks of
International Business Machines Corporation

AMP is a trademark of AMP Incorporated.

Molex is a trademark of Molex Incorporated.

DATA MATE is a trademark of AMP Incorporated

Western Digital is a trademark of the Western Digital Corporation

NEXT is a trademark of NEXT Corporation

Adobe is a trademark of Adobe Systems Incorporated

Acrobat is a trademark of Adobe Systems Incorporated

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