Western Digital 3.5" 400GB SATA Hard Drive

Cool, quiet operation, superior performance and industry-leading reliability make these EIDE drives ideal for desktop, business, and consumer electronics storage.

Key Features Fast - 8 MB cache - Keeps more of your data in high-speed memory for unsurpassed performance in its class. Fast 7200 RPM spindle speed and next-generation SATA 3 Gb/s interface. For even higher performance, consider WD Caviar SE16 SATA 3 Gb/s hard drives.

Cool - Cool operation results in the highest reliability, even in intensely hot environments such as digital video recorders. That's why these, the coolest on the market, are the drives of choice for the world's leading consumer electronics and PC manufacturers.

Quiet - The technology that Tom's Hardware Guide called "very fast and nearly silent" is used throughout this family of drives. Our WhisperDrive technology minimizes noise to levels near the threshold of human hearing. To cut seek noise, SoftSeek technology streamlines read/write seeking algorithms, resulting in more efficient operation.

Ideal For
High-performance family and business computing. These drives easily handle photo editing and data-intensive multimedia applications.

How this WD hard drive protects your data

Data Lifeguard is an exclusive set of data protection features, including shock protection, an environmental protection system and real-time embedded error detection and repair. WD's Data Lifeguard technology automatically finds, isolates, and repairs problems that may develop over the life of a hard drive.

Data Lifeguard Tools are software utilities designed for WD hard drives that work with the embedded Data Lifeguard features to make hard drive installation,diagnostics and repair both simple and worry-free. (Download Data Lifeguard Tools)

ShockGuard instantaneously protects the hard drive against damage from bumps and vibrations while it is running. This technology enables WD Caviar drives to achieve industry-leading shock specifications.

Performance Specifications

Rotational Speed : 7,200 RPM (nominal)
Buffer Size : 8 MB
Average Latency : 4.20 ms (nominal)
Start/Stop Cycles : 50,000 minimum

Seek Times

Read Seek Time : 8.9 ms
Write Seek Time : 10.9 ms (average)
Track-To-Track Seek Time : 2.0 ms (average)
Full Stroke Seek : 21.0 ms (average)

Transfer Rates

Buffer To Disk : 972 Mbits/s (Max)
Buffer to Host (Serial ATA) : 3 GB/s (max)

Physical Specifications

Formatted Capacity : 400,088 MB
Capacity : 400 GB
Interface EIDE : SATA 3 GB/s
User Sectors Per Drive : 781,422,768

Physical Dimensions

Height : 25.4 mm (Max)
Length : 147 mm (Max)
Width : 101.6 mm
Weight : 0.60 kg

Environmental Specifications

Shock
Operating Shock (Read) : 65G, 2 ms
Non-operating Shock : 350G, 2 ms

Acoustics
Idle Mode : 28 dBA (average)
Seek Mode 0 : 26 dBA (average)
Seek Mode 3 : 26 dBA (average)

Temperature
Operating : -0° C to 60° C
Non-operating : -40° C to 65° C

Humidity
Operating : 5-95% RH non-condensing
Non-operating : 5-95% RH non-condensing

Altitude
Operating : -305M to 3,050M
Non-operating : -305M to 12,200M

Vibration
Operating
Linear : 20-300 Hz, 0.75 G (0 to peak)
Random : 7-500 Hz, 0.00221 g² / Hz

Non-operating
Low Frequency : 10-300 Hz, 0.195 inches (double amplitude)
High Frequency : 300-500 Hz, 5.0G (0 to peak)

Electrical Specifications

12 VDC
Read/Write : 395 mA
Idle : 380 mA
Standby : 6 mA
Sleep : 6 mA

5 VDC
Read/Write : 660 mA
Idle : 532 mA
Standby : 180 mA
Sleep : 180 mA

Power Dissipation
Read/Write : 7.80 Watts
Idle : 7.20 Watts
Standby : 0.97 Watts
Sleep : 0.97 Watts