Western Digital Corp. WD2500JB hard drive specifications

Western Digital Caviar Special Edition 250 GB hard drive

Western Digital's Special Edition hard drives are designed to maximize desktop computer performance for activities requiring high-performance storage such as computer gaming, digital video editing, and file server applications. Offering the largest capacities, the Western Digital's Special Edition family is equipped with an 8 MB buffer - the largest buffer available today in a desktop EIDE hard drive, delivering data to users faster than any hard drive in its class. The Special Edition hard drive provides a higher percentage of cache hits and significantly faster time to data than industry-standard 2 MB versions. Within the complex operations of hard drives, the buffer is used to hold the results of recent reads from the disk, and also to "pre-fetch" information that is likely to be requested in the near future. The use of an increased buffer improves the performance by reducing the number of physical accesses to the disk and allowing data to stream from the disk uninterrupted by mechanical operations.

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Manufacturer
Western Digital Corp.

HDD Part Number
WD2500JB


Hard drive health monitoring software
ActiveSMART by Ariolic Software. Click to download ActiveSMART

General

Device Type
Internal - Internal hard drive

Width
4 in

Depth
5.8 in

Height
1 in

Weight
1.3 lbs

Hard Drive

Form Factor

Capacity
250 GB

Interface Type
DMA/ATA-133 (Ultra) Fast Drives

Buffer Size
8 MB

Bytes per Sector
512

Features
Shock Guard, Data Lifeguard

Compliant Standards
S.M.A.R.T.

Performance

Drive Transfer Rate
100 MBps

Internal Data Rate
93.5 MBps

Seek Time
8.9 ms (average) / 21 ms (max)

Track-to-Track Seek Time
2 ms

Average Latency
4.2 ms

Spindle Speed
7200 rpm

Reliability

Storage Hard Drive / Recoverable Errors
1 per 10^14

Storage Hard Drive / Non-Recoverable Errors
1 per 10^15

Start / Stop Cycles
50,000

Storage Controller

Type
None

Expansion / Connectivity

Interfaces
1 x IDE/ATAPI - 40 pin IDC

Compatible Bays
1 x Internal - 3.5" x 1/3H

Miscellaneous

Compliant Standards
RoHS

Package Type
OEM

Software / System Requirements

Software Included
Drivers & Utilities, Data Lifeguard Tools

Manufacturer Warranty

Service & Support
3 years warranty

Service & Support Details
Limited warranty - 3 years

Environmental Parameters

Min Operating Temperature
41 �F

Max Operating Temperature
131 �F

Humidity Range Operating
5 - 95%

Shock Tolerance
65 g @ 2ms half-sine pulse (operating) / 250 g @ 2ms half-sine pulse (non-operating)

Vibration Tolerance
0.75 g @ 20-300 Hz (operating) / 4 g @ 20-500 Hz (non-operating)

Sound Emission
35 dBA

Max Altitude Operating
10000 ft


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