Leading-edge technology and innovative design for
high-performance, high-capacity mobile hard drives
IBM Travelstar 25GS, 18GT, and 12GN
2.5-inch hard disk drives
Highlights
The IBM Travelstar* 25GS offers
several industry firsts: a recordsetting capacity of 25 GB, a media
transfer rate of up to 181.2 Mbits/
sec, and a disk rotational speed of
5400 RPM.
The new IBM Travelstar 18GT and
12GN hard drives provide areal
densities of 10.1 Gbits/sq. in. and
6 GB of capacity per disk.
The IBM Travelstar 12GN has the
industry’s highest shock rating of
800 G/1 ms.
Fast Ultra-DMA interface transfer
rates reach as high as 66 MB/sec.
An advanced electromechanical
design provides exceptional
storage capacities and superior
shock ratings to improve reliability and ruggedness.
Leading-edge technology
Featuring a wide array of leading-edge
technologies, the IBM Travelstar 25GS,
18GT, and 12GN mobile hard drives
continue the tradition of IBM leadership
in the mobile storage arena. These IBM
Travelstar drives employ advanced
design and engineering innovations to
significantly increase shock resistance
while simultaneously reducing heat and
noise levels. As a result, the new IBM
Travelstar drives are ideally suited for
demanding, high-capacity Internet,
digital audio, video streaming, and realtime multimedia applications—whether
users are in the office or on the road.
The innovative hard drive design
combines IBM giant magnetoresistive
(GMR) head technology, Partial
Response Maximum Likelihood (PRML)
digital channel, a head load/unload
feature, a more rigid base casting than
previous models, Enhanced Adaptive
Battery Life Extender* (ABLE) 3.0, and
state-of-the-art manufacturing techniques. This design provides the
exceptional storage capacity, performance, power management, quality,
and reliability required by today’s
notebook systems.
Performance and reliability
IBM Travelstar drives include IBM drive
fitness technologies, a set of diagnostic
tools including IBM Drive Fitness Test*
(DFT) and Self-Monitoring Analysis and
Reporting Technology (S.M.A.R.T.). In
addition, the new IBM Travelstar 25GS,
18GT, and 12GN drives employ a
thermistor, an adaptive control device
that helps maintain high performance
and fast seek times at high environmental temperatures.
IBM Travelstar 25GS 17-mm 5400 RPM,
25 GB ATA-4 hard drive
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IBM Travelstar 25GS 17-mm 5400 RPM,
25 GB ATA-4 hard drive
IBM Travelstar hard disk drive characteristics
Feature Benefit
First 5400 RPM mobile hard drive IBM Travelstar 25GS provides outstanding
First 25 GB mobile hard drive IBM Travelstar 25GS has the capacity to enable
First 800 G/1 ms shock rating for a IBM Travelstar 12GN provides exceptional ruggedness
2.5-inch mobile hard drive to help withstand shock while increasing drive
High areal density of 10.1 Gbits/sq. in. IBM Travelstar 18GT and 12GN maximize areal density
and 6 GB of capacity per disk to enable more data storage per disk in standard,
Fast Ultra-DMA 66 2.5-inch mobile IBM Travelstar 25GS, 18GT, and 12GN all feature high
hard drives data transfer rates to help ensure the ultimate
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IBM Travelstar 18GT 12.5-mm 4200 RPM,
18 GB ATA-4 hard drive
performance and seek times at near-desktop
equivalence without sacrificing high capacity
mobile users to work with a new range of emerging
storage-intensive applications
reliability and extending drive lifetime
compact packages
performance possible
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IBM Travelstar 12GN 9.5-mm 4200 RPM,
12 GB ATA-4 hard drive
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IBM drive fitness technologies IBM DFT and S.M.A.R.T. capabilities help enhance
reliability
IBM quality, support, and service
The new IBM Travelstar mobile hard drives
share common field-proven components
to provide manufacturers with superiorquality hard drives backed by a threeyear warranty and IBM technical support
and services.
IBM family of Travelstar 25GS, 18GT, and 12GN hard disk drives at a glance
Product name Travelstar 25GS Travelstar 18GT Travelstar 12GN
Model DARA-225000 DARA-218000/215000 DARA-212000/209000/206000
Configuration
In te rfa ce ATA- 4 ATA- 4 ATA- 4
Capacity (GB) 25.3 18.1/15.1 12.0/9.0/6.0
Sector size (bytes) 512 512 512
Recording zones 12 12 12
User cylinders 16,064 17,088 17,088
Data heads 10 6/5 4/3/2
Disks 5 3/3 2/2/1
Ma x. areal den sit y (Gbits/sq. in.) 8.8 10.1 10.1
Max. recording density (KBPI) 327.4 356.0 356.0
Track density (KTPI) 26.8 28.5 28.5
Drive Fitness Test Supported Supported Supported
Performance
Data buffer (KB) 512
2
512
2
512
2
Rotational speed (RPM) 5411 4200 4200
Latency (average ms) 5.5 7.1 7.1
Me dia transfe r ra te (M bits/s ec) 105.1-181.2 85.5-161.6 85.5-161.6
Interface transfer rate (MB/sec) 66.6 Ultra-DMA mode 4 66.6 Ultra-DMA mode 4 66.6 Ultra-DMA mode 4
16.6 PIO mode 4 16.6 PIO mode 4 16.6 PIO mode 4
Seek time (ms)
Average ( typical) 12.0 12.0 12.0
Single track (typical) 2.5 2.5 2.5
Full stroke (typical) 23.0 23.0 23.0
Reliability
Error rate (nonrecoverable) <1 per 1.0E13 bits transferred <1 per 1.0E13 bits transferred <1 per 1.0E13 bits transferred
Load/unload cycles 300,000 300,000 300,000
Power
Voltage requirement (VDC) +5 (± 5 %) +5 (± 5 %) +5 (± 5 %)
Dissipation (W)
Startup (max. peak) 5.0 4.7 4.7
Seek (typical) 2.6 2.3 2.3
Read (typical) 2.5 2.1 2.0
Write (typical) 2.7 2.2 2.1
Performance idle (typical) 2.0 1.85 1.85
Active idle (typical) 1.3 0.95 0.85
Low power idle (typical) 0.85 0.65 0.65
Standby (typica l) 0.25 0.25 0.25
Sleep (typical) 0.1 0.1 0.1
Power consumption efficiency (watts/MB) 0.00003 0.00004/0.00004 0.00005/0.00007/0.00001
Physical size
He ight ( mm) 17.0 12.5 9.5
Width (mm, nominal) 69.9 69.9 69.9
Depth (mm, nominal) 100.2 100.2 100.2
Weight (g) 185.0 135.0 99.0
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 40.0° C
Shock (half sine wave) Travelstar 25GS: 150 G/2 ms Travelstar 25GS: 500 G/2 ms
Travelstar 18GT: 175 G/2 ms Travelstar 18GT: 700 G/1 ms
Travelstar 12GN: 175 G/2 ms Travelstar 12GN: 800 G/1 ms
Vibration
Random (RMS) 0.67 G (5-500 Hz) 3.01 G (2.5-500 Hz)
Swept sine1 G 0-peak (5-500 Hz)5 G 0-peak (10-500 Hz)
Warranty Three years Three years Three years
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Up to 9 4 KB used for fir mware
For more information
Internet and e-mail:
• www.ibm.com/harddrive
• drive@us.ibm.com
IBM TECHFAX document server:
• 408-256-5418 (requires touch-tone phone)
• International callers must call from a fax
machine
IBM hard drive product information:
• 1 888-IBM-5214 (United States)
• 507-253-4110 (outside of the United States)
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
8-99
All rights reserved
1
Clear cover drive models shown for illustration
purposes only.
* IBM is a registered trademark and Adaptive Battery
Life Extender, Travelstar, and Drive Fitness Test 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 is 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 #7108
G225-6837-00
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