WD Caviar 40 GB 3.5" Internal Hard Drive - WD400BD

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Product Overview

WD Caviar SATA hard drives are designed for mainstream desktop personal computers. They feature a fast 7200 RPM spindle speed, a 2 MB cache buffer, and up to 250 GB of storage. WD Caviar drives are built to the highest standards of quality and reliability by people who understand the importance of your data.


Manufacturer Western Digital
Mfg Part# WD400BD
SKU 201643981
UPC 718037719702
UPC 14 00718037719702
Product Guide Click Here for the Western Digital Store
Fast - 7200 RPM, 2 MB cache buffer
SATA - up to 3 Gb/s burst transfer rates.
Quiet - Fluid Dynamic Bearing (FDB) technology - Less friction means more reliability; less heat, vibration, and noise.
Tech Specs
Performance Specifications
Buffer To Host (Serial ATA): 3 Gb/s (Max)
Transfer Rate (Buffer To Disk): 748 Mbits/s (Max)
Physical Specifications
Formatted Capacity: 40,020 MB
Capacity: 40 GB
Interface: SATA 3 Gb/s
User Sectors Per Drive: 78,165,360
Physical Dimensions
Height: 1.028 Inches (Max)
Length: 5.787 Inches (Max)
Width: 4.00 Inches (+/- 0.010 inch)
Weight: 1.60 Pounds
Environmental Specifications
Operating Shock (Read): 65G, 2 ms
Non-operating Shock: 350G, 2 ms
Idle Mode: 30 dBA (average)
Seek Mode: 0 32 dBA (average)
Seek Mode: 3 31 dBA (average)
Operating: 41° F to 131° F
Non-operating: -40° F to 149° F
Operating 5-95% RH non-condensing
Non-operating 5-95% RH non-condensing
Operating: -1,000 feet to 10,000 feet
Non-operating: -1,000 feet to 40,000 feet
Operating Linear: 10-300 Hz, 3.0G (0 to peak)
Operating Random: 10-300 Hz, 0.008 g² / Hz
Electrical Specifications
12 VDC (Read/Write): 450 mA
12 VDC (Idle): 470 mA
12 VDC (Standby): 23 mA
12 VDC (Sleep): 23 mA
5 VDC (Read/Write): 800 mA
5 VDC (Idle): 750 mA
5 VDC (Standby): 330 mA
5 VDC (Sleep): 200 mA
Power Dissipation (Read/Write): 12.80 Watts
Power Dissipation (Idle): 9.50 Watts
Power Dissipation (Standby): 1.90 Watts
Power Dissipation (Sleep): 1.30 Watts
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