Hitachi DJNA-352500, DJNA-352030, DJNA-372200, DJNA-371800, DJNA-351520 Reference Guide

Powerful solutions and innovations in desktop
storage for the workplace and home

IBM Deskstar 25GP and Deskstar 22GXP
hard disk drives

Highlights

The IBM Deskstar* family pro­vides industry-leading capacity
and performance. The Deskstar
25GP leads in capacity with a
maximum of 25.0 GB at 5400 RPM.
The Deskstar 22GXP leads the
industry in both capacity and
performance with a maximum of

22.0 GB at 7200 RPM.

Average seek times of 9.0 millisec­onds, with sustained data rates of
up to 15.5 MB/sec (Deskstar 25GP)
and 17.9 MB/sec (Deskstar 22GXP),
a maximum of 2.0 MB cache, and
high internal data rates enable
benchmark-winning performance.

Giant magnetoresistive (GMR)
head technology enables one of
the industry’s highest areal
densities and 5.1 GB of capacity
per disk.

An Ultra ATA/66 interface supports
transfer rates of up to 66.7 MB/sec
in Ultra DMA Mode-4. All models
ensure data reliability across the
interface with cyclic redundancy
checking (CRC).

The IBM Drive Fitness Test* (DFT)
helps the user to isolate system
failures by providing status about
drive functionality, thus reducing
the possibility of unnecessary
return of a functional drive.

Leading drive technology

With the IBM Deskstar 25GP and Deskstar
22GXP, IBM provides the capacity and
performance to handle a wide range of
advanced desktop applications. The IBM
Deskstar 25GP offers the industry’s largest
capacity of 25.0 GB in an ATA interface
drive. With a maximum capacity of 5.1 GB
per disk, the IBM Deskstar 25GP packs
significant amounts of data onto a one-inch
high disk drive. The IBM Deskstar 22GXP
features a maximum capacity of 22.0 GB
at 7200 RPM, giving users high capacity and
fast access to information.

These drives use IBM giant magneto­resistive (GMR) advanced head technol­ogy, which enables increased areal
densit y. S.M.A.R.T. 3 improves relia bility as
it provides background reassignment of
defective sectors. Further circuit integra­tion reduces power requirements and
increases reliability. No-ID* sector
formatting increases capacity by helping
to eliminate the overhead caused by
duplicate storage of data sector ID fields.
An Ultra ATA/66 interface provides
superior data performance. In addition,
partial response maximum likelihood
(PRML) digital data channel increases
media-to-buffer and buffer transfer rates.

Advanced desktop systems

As the company that pioneered disk drive
technology, IBM once again is setting new
standards for today’s data storage technol­ogy by designing innovative hard disk drives
that help meet the evolving requirements of
high-performance desktop users. The IBM
Deskstar 25GP and Deskstar 22GXP
provide the industry’s highest storage

capacities for desktop systems. The fast
speeds and high capacities translate directly
into higher quality video pictures, superior
CAD/CAM performance, and significantly
faster turnaround for the emerging wave of
data-intensive multimedia applications.

IBM quality and service

IBM drives are backed by an array of
technical support and services, which
may include customer and qualified
support and integration assistance. The
support package is designed to help
ensure that IBM customers can continue
to develop and manufacture high-quality,
cost-effective systems.

Deskstar 25GP 3.5-inch 25.0, 20.3, 15.2,
an d 10.1 GB low-profile ATA disk drive

Deskstar 22GXP 3.5-inch 22.0, 18.0, 13.5,
and 9.1 GB low-profile ATA disk drive

IBM Deskstar 25GP and Deskstar 22GXP at a glance
Model Deskstar 25GP Deskstar 22GXP

DJNA-352500/352030/ DJNA-372200/371800/
351520/351010 371350/379100

For more information

Internet and e-mail:

• www.ibm.com/harddrive

• [e-mail]

Configuration

Interface ATA-4 ATA-4
Capacity (GB) 25.0/20.3/15.2/10.1 22.0/18.0/13.5/9.1
Sector size (bytes) 512 512
Rec ord in g zon e 12 12
User cylinders (physical) 15,302 15,012
Data heads (physical) 10/8/6/4 10/8/6/4
Data disks 5/4/3/2 5/4/3/2
Max. areal density (Mbits/sq. inch) 3740 3432
Max. recording density (BPI) 233.8k 218.6k
Track density (TPI) 16,000 15,700

Performance

Data buffer (KB) 2000

1

/20001/5121/512

1

20001/20001/20001/2000
Rotational speed (RPM) 5400 7200
Latency (average ms) 5.56 4.17
Media transfer rate (max Mbits/sec) 195.6 223.4
Interface transfer rate (max MB/sec) 66.7 66.7
Sustained data rate (MB/sec) 15.5 to 8.7 17.9 to 10.7
Seek time (read typical)

Average (ms) 9.0 9.0
Track-to-track (ms) 2.2 2.2
Full-track (ms) 15.5 15.5

Reliability

Error rate (nonrecoverable) 1 in 10E13 1 in 10E13
Contact start stop (at 40° C) 40,000 40,000

Power

Requirement +5 VDC (± 5 %), +12 VDC (+10 %/-8%)
Dissipation (typical)

Startup current (max A) 0.65(5V), 2.00(12V), 0.72(5V), 2.04(12V),

0.64(5V), 1.58(12V) 0.71(5V), 1.94(12V)

Idle (W) 4.9/3.4 6.9/5.2

Power consumption efficiency (watts/MB) 0.0002/0.0002/ 0.0003/0.0004

0.0002/0.0003 0.0004/0.0006

Physical size

He ight ( mm) 25.4 2 5.4
Width (mm) 101.6 101.6
Depth (mm) 146 146
Weight (max g) 630/630/560/560 630/630/560/560

Environmental characteristics Operating Nonoperating

Ambient temperature 5 to 55° C -40 to 65° C
Relative humidity (noncondensing) 8 to 90% 5 to 95%
Maximum wet bulb (noncondensing) 29.4° C 35° C
Shock (half sine wave) 10 G/11 ms or 65 G/2 ms 75 G/11 ms or 175 G/2 ms
Vibration (random [RMS]) 0.67 for horizontal, 1.04

0.56 for vertical

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Upper 82 KB used for firm ware.

IBM TECHFAX document server:

• 408-256-5418 (requires touch-tone phone)

• International callers must call from a fax
machine

IBM hard disk drive product information:

• 1 888 -IBM-5214 (United States)

• 507-253-4110 (outside of the United States)

1

www.ibm.com/harddrive

© International Business Machines Corporation 1999

IBM Storage Systems Division
5600 Cottle Road
San Jose, CA 95193

Produced in the United States
4-99
All rights reserved

* IBM is a registered trademark and Deskstar, Drive
Fitness Test, and No-ID are trademarks of Interna­tional Business Machines Corporation. Other names
are trademarks or registered trademarks of their
respective owners.

Product description data represents design
objectives and is provided for comparative purposes;
actual results may vary depending on a variety of
factors. Product claims are true as of the date of the
first printing. This product data does not constitute a
warranty. Questions regarding IBM warranty terms or
the methodology used to derive this data should be
referred to an IBM representative.

Data subject to change without notice. IBM
development plans are subject to change at any time
without prior notice.

References in this publication to IBM products, programs,
or services do not imply that IBM intends to make them
available in all countries in which IBM operates.

TECHFAX #7103

G225-6818-01