Description

Western Digital 320GB JS 8MB CACHE 7200RPM SATAII

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Cool, quiet operation, superior performance and industry-leading reliability make these SATA 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 300 MB/s interface. For even higher performance, consider WD Caviar SE16 SATA 300 MB/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. For even higher performance, consider WD Caviar SE16 SATA hard drives.

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.

Specification

Performance Specifications

* Rotational Speed 7,200 RPM (nominal)
* Buffer Size 8 MB
* Average Latency 4.20 ms (nominal)
* Seek Times
* Read Seek Time 8.9 ms
* Track-To-Track Seek Time 2.0 ms (average)
* Full Stroke Seek 21.0 ms (average)

Transfer Rates

* Buffer To Host (Serial ATA) 300 MB/s (Max)
* Buffer To Disk 748 Mbits/s (Max)
* Physical Specifications
* Formatted Capacity 320,072 MB
* Capacity 320 GB
* Interface SATA 300 MB/s
* User Sectors Per Drive 625,142,448

Physical Dimensions

English

* Height 1.028 Inches (Max)
* Length 5.787 Inches (Max)
* Width 4.00 Inches (+/- 0.010 inch)
* Weight 1.32 Pounds

Metric

* Height 26.1 mm (Max)
* Length 147 mm (Max)
* Width 101.6 mm
* Weight 0.6 kg

Environmental Specifications

Shock

* Operating Shock (Read) 65G, 2 ms
* Non-operating Shock 250G, 2 ms

Acoustics

* Idle Mode 26 dBA (average)
* Seek Mode 0 31 dBA (average)
* Seek Mode 3 27 dBA (average)

Temperature (English)

* Operating 41� F to 131� F
* Non-operating -40� F to 149� F

Temperature (Metric)

* Operating 5� C to 55� C
* Non-operating -40� C to 65� C

Humidity

* Operating 5-95% RH non-condensing
* Non-operating 5-95% 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

Vibration

* Operating
* Linear 20-300 Hz, .75G (0 to peak)
* Random 10-300 Hz, 0.004 g� / Hz
* Non-operating
* Low Frequency 5-20 Hz, 0.195 inches (double amplitude)
* High Frequency 20-500 Hz, 4.0G (0 to peak)

Electrical Specifications

* Current Requirements 12 VDC
* Read/Write 450 mA
* Idle 430 mA
* Standby 20 mA
* Sleep 20 mA
* 5 VDC
* Read/Write 800 mA
* Idle 730 mA
* Standby 270 mA
* Sleep 250 mA

Power Dissipation

* Read/Write 9.50 Watts
* Idle 8.75 Watts
* Standby 1.60 Watts
* Sleep 1.50 Watts