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WD Caviar WD4000AAJS 400 GB 3.5" Internal Hard Drive - WD4000AAJS

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Product Overview

WD Caviar® Blue™ hard drives are available with either SATA or EIDE interface in a variety of cache sizes with a multitude of available features to deliver rock solid performance and ultra-cool and quiet operation. Pick the drive that suits your needs with the confidence in knowing that all WD Caviar Blue drives are built to the highest standards of quality and reliability. With capacities ranging from 40 GB to 750 GB, these drives are the perfect solution for family and business computing.


Manufacturer Western Digital
Mfg Part# WD4000AAJS
SKU 203942349
UPC 718037719245
UPC 14 00718037719245
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Solid performance
Ultra cool and quiet
Tech Specs
Performance Specifications
Buffer To Host (Serial ATA): 3 Gb/s (Max)
Transfer Rate (Buffer To Disk): 972 Mbits/s (Max)
Physical Specifications
Formatted Capacity: 400,088 MB
Capacity: 400 GB
Interface: SATA 3 Gb/s
User Sectors Per Drive: 781,422,768
Physical Dimensions
Height: 1.028 Inches (Max)
Length: 5.787 Inches (Max)
Width: 4.00 Inches (+/- 0.010 inch)
Weight: 1.33 Pounds
Environmental Specifications
Operating Shock (Read): 65G, 2 ms
Non-operating Shock: 350G, 2 ms
Idle Mode: 28 dBA (average)
Seek Mode: 0 26 dBA (average)
Seek Mode: 3 26 dBA (average)
Temperature Operating: 32° F to 140° F
Temperature Non-operating: -40° F to 149° F
Humidity Operating: 5-95% RH non-condensing
Humidity Non-operating: 5-95% RH non-condensing
Altitude Operating: -1,000 feet to 10,000 feet
Altitude Non-operating: -1,000 feet to 40,000 feet
Vibration Operating (Linear): 20-300 Hz, 0.75 G (0 to peak)
Vibration Operating (Random): 7-500 Hz (0.00221 g² / Hz)
Electrical Specifications
12 VDC (Read/Write): 395 mA
12 VDC (Idle): 380 mA
12 VDC (Standby): 6 mA
12 VDC (Sleep): 6 mA
5 VDC (Read/Write): 660 mA
5 VDC (Idle): 532 mA
5 VDC (Standby): 180 mA
5 VDC (Sleep): 180 mA
Power Dissipation (Read/Write): 7.80 Watts
Power Dissipation (Idle): 7.20 Watts
Power Dissipation (Standby): 0.97 Watts
Power Dissipation (Sleep): 0.97 Watts
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