Western Digital SATA Hard Disk WD400BD

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Western Digital Part #/MPN: WD400BD

DiscTech Item #: WDC-WD400BD-NP-OE

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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

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

New Pull

Condition Levels Explained

The product has been mounted in a brand new system (e.g. server), then removed from the system, before entering service. These products may have a few hours of usage due to system build time etc. Ostensibly however, New Pulls are electronically new items, which may show signs of being physically mounted and unmounted. All handling is performed by trained technicians, taking full ESD precautions.

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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