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    Western Digital WD2500JD Hard Drive

Product :

WD2500JD 7200RPM 250GB HDD

Manufacturer :

Western Digital

Reviewed by :

Wayne Brooker

Price :

£146.12 + VAT Approx. (EBUYER)

Date :

January 23rd , 2004.


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I don't know if it's bad luck or changes in technology but I seem to have been bogged down lately with reviews that seem to be taking for ever to complete. The more you try to obtain accurate and repeatable results the more you realise that that's a far more difficult task than it sounds of late, and I'm not just talking about graphics cards either.

When this hard drive first arrived on my doorstep some time back I assumed that testing it was going to be a simple affair. I was wrong. With results from the same batch of benchmarks varying by as much as 300% it was looking like time to investigate a new method of testing.

Look around the 'Net and you'll see there's no shortage of hard drive benchmarks, unfortunately many of them offer measurements of parameters that are of only limited usefulness to somebody who really has no desire to spend six months studying the innermost technicalities of hard drive geekery. No, what I wanted was a few relatively simple tests that would give results that we can all understand.

That proved to be only half of the battle though. Just as every benchmark gave differing results for supposedly the same tests, so it seemed that different platforms introduced varying errors to the final figures. AMD users will no doubt feel aggrieved when I tell you that by far the tightest sets of figures were achieved throughout on Intel platform motherboards and as a result of this I've decided to standardise all future hard drive benchmarks by running them on a specific i865 based test system.

Anyway, that's a little of the background to this review out of the way, time to talk a little bit about our subject. The WD2500JD is a capacious 250GB comprising three 83GB platters spinning at 7200RPM.

The "JD" suffix proclaims this as an 8MB cache model with Serial-ATA interface ("JB" denotes the Parallel-ATA version) and conventional ball type spindle bearings.

Sit tight and we'll do the specs!


  • 8 MB cache buffer – fast data transfer from a cache four times larger than the industry-standard 2 MB size.
  • 7200 RPM – high-performance rotational speed for high-capacity hard drives.
  • Data Lifeguard Tools™ – software utility that works in conjunction with the embedded Data Lifeguard features (including shock protection, an environmental protection system, and embedded error detection and repair features) to make hard drive management diagnostics and repair simple and worry-free.
  • SecureConnect™ – provides a 500 percent stronger cable-to-drive connection than first-generation SATA hard drives and cables; ensures backward compatibility with legacy SATA cables and backplanes.
  • FlexPower™ – connector technology that accepts power from both industry-standard and new SATA power supplies.
  • Point-to-point bus configuration – utilizes the full bandwidth of each drive interface in a networked environment.
  • Hot plug support – ability to swap out a hard drive without having to power down the system or reboot promotes system design flexibility, data availability, and serviceability.
  • Backplane compatibility – promotes expandability and flexibility in system architecture.
  • Longer, narrower cable – prevents incorrect mating and bent pins, providing greater reliability and reduced service calls.
Physical Specifications
Formatted Capacity 1 250,059 MB 
Interface 1.5 Gb/s Interface
(Serial ATA 1.0)
Bytes Per Sector (STD) 512
User Sectors Per Drive 488,397,168
Dedicated Landing Zone Yes
Actuator Latch/Auto Park Yes
Performance Specifications
Data Transfer Rate
- Buffer to Host
- Buffer to Disk

150 MB/s 2
748 Mbits/s max
Average Read Seek 8.9 ms (average)
Track-to-Track Seek 3 2.0 ms (average)
Full Stroke Read Seek 3 21 ms (average)
Average Latency 4.2 ms
Rotational Speed 7200 RPM
Read Cache Adaptive
Write Cache Yes
Buffer 8 MB
Drive Ready Time 9.0 sec (average)
Start/Stop Cycles 50,000 minimum
LBA Support Yes
Error Rate
<1 in 1014 bits read
Physical Dimensions
Height English: 1.028 inches max
  Metric: 25.4 mm max
Length English: 5.787 inches max
  Metric: 147.0 mm max
Width English: 4.00 inches ±0.010 inch
  Metric: 101.6 mm ±0.25 mm
Weight English: 1.32 pounds ±0.13 pounds
  Metric: 0.60 kg ±0.06 kg

Power Requirements (average)
Mode   RMS Current   Power
  12V (±10%) 5V (±5%)  
Read/Write 4 530 mA 850 mA 10.6 W
Idle 510 mA 780 mA 10.0 W
Standby 30 mA 300 mA 1.8 W
Sleep 30 mA 190 mA 1.3 W
Environmental Specifications 5
  Operating (2 ms) 30G (write), 65G (read)
  Non-operating (2 ms)6 250G
  Operating - Random
                   - Linear
0.004 g2/Hz (10 to 300 Hz)
20-300 Hz, 0.75G (0 to peak)
  Non-operating - Linear 5-20 Hz, 0.195 inches (dbl amp)
20-500 Hz, 4.0G (0 to peak)
Operating Temperature and Humidity
  Temperature 5°C to 55°C
  Humidity 5-95% RH non-condensing
  Thermal Gradient 20°C/hour (max)
Non-Operating Temperature and Humidity
  Temperature -40°C to 65°C
  Humidity 5-95% RH non-condensing
  Thermal Gradient 30°C/hour
Acoustics (average)
  Idle Mode 7 34 dBA 
  Seek Mode 0 7 36 dBA 
  Seek Mode 3 7 35 dBA 
Reliability Specifications
  Warranty  3 years 8

1 Western Digital defines a megabyte (MB) as 1,000,000 bytes, and a gigabyte (GB) as 1,000,000,000 bytes.
2 Effective maximum transfer rate running Serial 1.0.
3 On reads and writes.
4 20% duty cycle.
5 No non-recoverable errors during operating tests or after non-operating tests.
6 Half sine wave measured in 2 ms duration, measured without isolation.
7 Sound power level.
8 Three-year standard warranty on WD Caviar Special Edition hard drives. This standard warranty may be subject to variations imposed by local law or regulations.




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