Western Digital Caviar WD400BB 40GB 7.2K 3.5" EIDE Hard Drive

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Western Digital Part #/MPN: WD400BB

DiscTech Item #: WDC-WD400BB-RF-OE

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    This item is currently (nearly) out of stock. It may be possible to arrange fast shipment. If you need it urgently call us. Otherwise, it usually ships within 1 week.


Capacity: 40GB

Speed: 7,200RPM

Interface Types: IDE ATA 3.5in

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Average Seek Time: 8.9 / 10.9

Electrical Interface: EIDE Ultra ATA100 100MBps

On-Board Cache: 2MB

Physical Specifications
Capacity 40GB
Interface 40-pin EIDE
Actuator Type Rotary Voice Coil
Bytes Per Sector 512
Servo Type Embedded

Performance Specifications
Average Seek 1

- Read

- Write
8.9 ms average

10.9 ms average
Track-to-Track Seek 2.0 ms average
Full Stroke Seek 21 ms average
Index Pulse Period 8.3 ms (nominal)
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Buffer Size 2 MB
Data Transfer Rate (maximum)

- Buffer to Host

- Buffer to Disk

100 MB/s (Mode 5 Ultra ATA)

66.6 MB/s (Mode 4 Ultra ATA)

33.3 MB/s (Mode 2 Ultra ATA)

16.6 MB/s (Mode 4 PIO)

16.6 MB/s (Mode 2 multi-word DMA)

748 Mbits/s maximum

Weight: 1.8 lb

Warranty: 1 Year DiscTech


Condition Levels Explained

The product has been built, rebuilt or repaired at the original manufacturer's factory (Note we NEVER sell 3rd party repaired items, as we do not find them to be reliable enough). Often these products are extremely close to new in condition, except that they contain at least one recycled or repaired component. Failure rates are often lower on these devices since they have been far more thoroughly tested than new items. Watch a video about our refurbishing process

1 Year DiscTech Warranty

Product Warranties Explained

The product has a DiscTech warranty for the time period specified. View our limited warranty

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