Filter
Top Products
Specifi cations Endurastar J4K50 Endurastar N4K50
Model(s) HEJ425050F9AT00 HEJ425040F9AT00
HEJ425030F9AT00 HEN425050F9AT00
HEN425040F9AT00 HEN425030F9AT00
Interface ATA-6 f
Capacity (GB)
1
50 / 40 / 30 f
Sector size (variable, Bytes/sector) 512 f
Recording zones 24 f
Data heads (physical) 2 f
Data Disks 1 f
Max. areal density (Gbits/sq. in.) 86.1 f
Performance
Data buffer (MB)
2
8 f
Rotational speed (RPM) 4260 f
Latency average (ms) 7.04 f
Media transfer rate (Mbits/sec, max) 388 f
Interface transfer rate (MB/sec, max) 100 Ultra DMA mode-5 f
16.6 PIO mode-4
Seek time (read, typical) (avg. ms) 13 f
Maximum (typical, ms) 24 f
Minimum (typical, ms) 3 f
Reliability
Error rate (non-recoverable) < 1 per 10
13
bits transferred f
Load/unload 600,000 f
Availability
3
(hrs/day x days/wk) 24x7 f
Power
Requirement +5 VDC (+/-5%) f
Startup (W, peak, max.) 6.5 f
Read / Write (W, avg.) 2.15 f
Low power idle (W, avg.) 0.8 f
Standby (W, avg.) 0.15 f
Sleep (W) 0.1 f
Physical size
z-height (mm) 9.5 f
Dimensions (width x depth, mm) 70 x 100 f
Weight (g, typ.) 95 f
Environmental (operating)
Ambient temperature -30° to 85° C -16o to 70o C
Altitude (m) -300 to 5,000 -300 to 3,000
Shock (half-sine wave) 250G (2ms) f
Vibration (sine wave) Up to 3G (10-500Hz) f
Environmental (non-operating)
Ambient temperature -40° to 95° C f
Altitude (m) -300 to 15,000 f
Shock (half-sine wave) 800G (1ms) f
Vibration (sine wave) Up to 5G (10-500Hz) f
Acoustics (A-weighted sound power)
Idle (Bels, typ.) 2.4 f
Op (Bels, typ.) 3.0 f
Endurastar
™
J4K50 and N4K50
Hitachi Global Storage Technologies’ trademarks are authorized for use in countries and jurisdictions in which Hitachi Global Storage Tech-
nologies has the right to use, market and advertise the brands. Contact Hitachi Global Storage Technologies for further information. Hitachi
Global Storage Technologies shall not be liable to third parties for unauthorized use of Hitachi Global Storage Technologies trademarks..
References in this publication to Hitachi Global Storage Technologies’ products, programs, or services do not imply that Hitachi Global
Storage Technologies intends to make these available in all countries in which it operates.
Product specifi cations provided are sample specifi cations and do not constitute a warranty. Information is true as of the date of
publication and is subject to change. Actual specifi cations for unique part numbers may vary. Please visit the Support section of our website,
www.hitachigst.com/support, for additional information on product specifi cations. Photographs may show design models.
© 2007 Hitachi Global Storage Technologies
Hitachi Global Storage Technologies
3403 Yerba Buena Road
San Jose, CA 95135 USA
Produced in the United States 8/06. Revised 3/08.
All rights reserved.
Endurastar
™
and Partners First
™
are trademarks of
Hitachi Global Storage Technologies.
DSEJ425007EN-02
Hitachi quality and service
Hitachi Endurastar hard disk drives are designed
to the highest quality standards and contain fi eld-
proven components. Hitachi provides worldwide
technical support and integration services to
enable global customers to bring their products
to market quickly.
Hitachi drives are backed by an array of technical
support and services, which may include
customer and integration assistance. Hitachi is
dedicated to providing a breadth of hard disk
drive solutions to satisfy all of today’s demanding
computing needs.
How to read the Travelstar model number
HTJ425050F9AT00 = 50 GB/8 MB buffer
H = Hitachi
E = Endurastar
J = J4K50 model (N = N4K50)
42 = 4200 RPM
50 = Full capacity — 50 GB
50 = Capacity this model, 50 = 50 GB
(40 = 40 GB, 30 = 30 GB)
F = Generation code
9 = 9.5mm z-height
AT = ATA interface
0 = Feature code
0 = Reserved
Information and Technical Support
www.hitachigst.com (Main Web site)
www.hitachigst.com/partners (Partner Web site)
North America
support_usa@hitachigst.com
Toll free: 1 888 426-5214, Direct: 1 507 322-2370
Asia Pacifi c
support_ap@hitachigst.com / 65 6840 9595
EMEA and UK
support_uk@hitachigst.com / 44 20 7133 0032
Germany
support_uk@hitachigst.com / 49 6929 993601
Program Support
Partners First
™
Program
channelpartners@hitachigst.com
1 One GB is equal to one billion bytes when referring to hard drive
capacity. Accessible capacity may be less.
2 Portion of buffer capacity used for drive fi rmware.
3 Intended for less than 20 percent duty cycle industrial applications
and other non mission critical applications.