Hitachi N4K50 Leaflet

Specifi cations 

Endurastar J4K50 

Endurastar N4K50

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 

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 

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 

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 

z-height (mm) 

9.5 

f 

Dimensions (width x depth, mm) 

70 x 100  

f 

Weight (g, typ.) 

95 

f 

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 

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 

Idle (Bels, typ.) 

2.4 

f 

Op (Bels, typ.) 

3.0 

f 

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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
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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

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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.