Western Digital SATA Hard Drive WD400BD

Western Digital Part #/MPN: WD400BD

DiscTech Item #: WDC-WD400BD-BN-OE-DEL

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Capacity: 40GB

Speed: 7,200RPM

Interface Types: SATA

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Average Seek Time: 8.9 / 10.9

Electrical Interface: SATA 300 - 3.0Gbps

On-Board Cache: 2MB

Western Digital Caviar 40GB 7.2K SATA Hard Drive WD400BD - Brand New OEM

Western Digital Caviar 40GB 7.2K SATA Hard Drive WD400BD - Brand New OEM

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)300 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

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Weight: 1.8 lb

Warranty: 1 Year DiscTech

Brand New

Condition Levels Explained

The product is brand new.

1 Year DiscTech Warranty

Product Warranties Explained

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