Western Digital 40GB SATA Hard Disks WD400BD

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Western Digital Part #/MPN: WD400BD

DiscTech Item #: WDC-WD400BD-RF-OE


Capacity: 40GB

Speed: 7,200RPM

Interface Types: SATA

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Sustained Throughput: 150

Average Seek Time: 8.9 / 10.9

Electrical Interface: SATA 150 - 1.50Gbps

On-Board Cache: 2MB

Western Digital Caviar 40GB 7.2K SATA Hard Drive WD400BD - Refurbished

WD Caviar SATA/EIDE hard drives are offered in capacities up to 250 GB, with performance geared to advanced and mainstream desktop personal computers. WD Caviar drives are built to the highest standards of quality and reliability because we understand the importance of data that is entrusted to our products.

Performance Specifications
Rotational Speed7,200 RPM (nominal)
Buffer Size2 MB
Average Latency4.20 ms (nominal)
Contact Start/Stop Cycles50,000 minimum
Seek Times
Read Seek Time8.9 ms
Write Seek Time10.9 ms (average)
Track-To-Track Seek Time2.0 ms (average)
Full Stroke Seek21.0 ms (average)
Transfer Rates
Buffer To Host (Serial ATA)150 MB/s (Max)
Buffer To Disk748 Mbits/s (Max)
Physical Specifications
Formatted Capacity40,020 MB
Capacity40 GB
InterfaceSATA 300 MB/s
User Sectors Per Drive78,165,360
Physical Dimensions
Height1.028 Inches (Max)
Length5.787 Inches (Max)
Width4.00 Inches (+/- 0.010 inch)
Weight1.60 Pounds
Height26.1 mm (Max)
Length147 mm (Max)
Width101.6 mm
Weight0.73 kg
Environmental Specifications
Operating Shock (Read)65G, 2 ms
Non-operating Shock350G, 2 ms
Idle Mode30 dBA (average)
Seek Mode 032 dBA (average)
Seek Mode 331 dBA (average)
Temperature (English)
Operating41° F to 131° F
Non-operating-40° F to 149° F
Temperature (Metric)
Operating5° C to 55° C
Non-operating-40° C to 65° C
Operating5-95% RH non-condensing
Non-operating5-95% RH non-condensing
Altitude (English)
Operating-1,000 feet to 10,000 feet
Non-operating-1,000 feet to 40,000 feet
Altitude (Metric)
Operating-305M to 3,050M
Non-operating-305M to 12,200M
Operating Vibration
Linear10-300 Hz, 3.0G (0 to peak)
Random10-300 Hz, 0.008 g² / Hz
Non-operating Vibration
Low Frequency5-20 Hz, 0.195 inches (double amplitude)
High Frequency20-300 Hz, 4.0G (0 to peak)
Electrical Specifications
12 VDC Current Requirements
Read/Write450 mA
Idle470 mA
Standby23 mA
Sleep23 mA
5 VDC Current Requirements
Read/Write800 mA
Idle750 mA
Standby330 mA
Sleep200 mA
Power Dissipation
Read/Write12.80 Watts
Idle9.50 Watts
Standby1.90 Watts
Sleep1.30 Watts

Click here to view the manufacturer's item description/brochure

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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