Hitachi HTA422020F9ATJ0, HTA422020F9ATN0 DATASHEET
The industry’s first and only hard drives built to perform in
extreme temperature environments
Hitachi Endurastar J4K20 and N4K20
2.5-inch hard disk drives
Highlights
20GB capacity
Operating temperature range from -20° C to +85° C
Fly height compensation accommodates changes in air density
caused by temperature and altitude
Built-in shock sensor enhances data integrity in automotive
applications
Enhanced moisture control system ensures corrosion control in
extreme environments
Practical Innovation
Hitachi presents a 2.5-inch hard disk
drive designed specifically to perform
in extreme temperature environments.
Offered at 20GB capacities, the new
Endurastar J4K20 and Endurastar N4K20
create a new generation of hard drives to
meet the expanding needs of emerging
markets.
Ideal for Automotive Applications
Built to operate in temperature ranges
of up to -20° C to +85° C, the Hitachi
Endurastar hard disk drives are the only
drives available in the market today
which support the environmental condi-
tions commonly found in the automotive
industry.
These drives are the ideal choice for
automotive applications, including car
navigation and car audio products.
Performance and Reliability
The new Endurastar models feature glass
media and load/unload technology in
addition to shock sensor technology,
which cushions the drive in less than ideal
shock or vibration conditions.
The J4K20 and N4K20 incorporate fluid
dynamic bearings (FDB) in the spindle
motor, re-designed to support a wider tem-
perature range. The new FDB allows the
same quiet operation and improved shock
characteristics as with PC models, but
offers even higher reliability for automotive
environments.
These features enable the Endurastar
drives to employ a non-operating shock
tolerance of 800G/1ms, and an operating
shock tolerance of 100G/11ms.
Hitachi Endurastar J4K20 and N4K20 hard disk drive specifications
Product name Endurastar J4K20 Endurastar N4K20
Model number HTA422020F9ATJ0 HTA422020F9ATN0
Configuration
Interface ATA-5 ATA-5
Capacity (GB)
Sector size (bytes) 512 512
Recording zones 16 16
Data heads 2 2
Disks 1 1
Max. areal density (Gbits/sq.inch) 37.7 37.7
Performance
Data buffer (MB)2 8 8
Rotational speed (rpm) 4172 4172
Latency (average ms) 7.2 7.2
Max. media transfer rate (MB/sec) 31.4 31.4
Max. interface transfer rate (MB/sec) 100MB/sec Ultra DMA mode-5 100MB/sec Ultra DMA mode-5
Seek time (ms)
Average (typical) 13 13
Maximum (typical) 24 24
Minimum (typical) 3 3
Reliability
Error rate (non-recoverable) < 1 per 1013 bits transferred < 1 per 1013 bits transferred
Load/unload cycle 300,000 300,000
Power (@ 25° C)
Requirement +5VDC(±5%) +5VDC(±5%)
Startup (max. peak) 6.5 W 6.5 W
Seek (average) 2.4 W 2.4 W
Read (average) 2.15 W 2.15 W
Write (average) 2.15 W 2.15 W
Performance idle (average) 1.8 W 1.8 W
Active idle (average) 0.80 W 0.80 W
Low power idle (average) 0.60 W 0.60 W
Standby (average) 0.15 W 0.15 W
Sleep 0.1 W 0.1 W
Physical size
Height (mm) 9.5 9.5
Width (mm) 70 70
Depth (mm) 100 100
Weight (g) 107 107
Environmental characteristics
Operating
Ambient temperature -20° to 85° C 0° to 60° C
Relative humidity (non-condensing) 5% - 90% 5% - 90%
Maximum wet bulb (non-condensing) 40° C 40° C
Shock (half sine wave) 100G/11ms 100G/11ms
Vibration (sine wave) 1.0 G (22 - 500Hz) 1.0 G (22 - 500Hz)
Non-operating
Ambient temp -40° to 85° C -40° to 85° C
Relative humidity (non-condensing) 5% - 95% 5% - 95%
Maximum wet bulb (non-condensing) 40° C 40° C
Shock (half sine wave) 800G/1ms 800G/1ms
Vibration (sine wave) 5.0G (22 - 500Hz) 5.0G (22 - 500Hz)
Acoustics (A-Weighted Sound Power (Bels))
Idle (typical) 2.4 2.4
Op (typical) 3.0 3.0
1
GB equals one billion bytes when referring to hard drive capacity; accessible capacity may be less.
2
Space reserved for firmware
1
20 20
Hitachi Global Storage Technologies
For more information
Internet and e-mail:
• www.hgst.com
• N. America: support_usa@hgst.com
• EMEA: support_uk@hgst.com
• Asia Pacic: support_ap@hgst.com
Hitachi hard drive product information:
• US: 1 888 426-5214
• For a complete list of worldwide phone
numbers, visit www.hgst.com/support
© Copyright Hitachi Global Storage Technologies 2003
Hitachi Global Storage Technologies
5600 Cottle Road
San Jose, CA 95193
Produced in the United States
9/03
All rights reserved
TravelstarTM is a trademark of
Hitachi Global Storage Technologies.
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Technologies products, programs or services do not
imply that Hitachi Global Storage Technologies intends
to make these available in all countries in which Hitachi
Global Storage Technologies operates.
Product information is provided for information purposes only and does not constitute a warranty.
Information is true as of the date of publication and is
subject to change. Actual results may vary.
This publication is for general guidance only.
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