Product Specifications
Interface	SATA 3 Gb/s
Performance Specifications
Rotational Speed	5,400 RPM (nominal)
Buffer Size	8 MB
Average Latency	5.50 ms (nominal)
Seek Times
Read Seek Time	12.0 ms
Track-To-Track Seek Time	2.0 ms (average)
Transfer Rates
Buffer To Host (Serial ATA)	3 Gb/s (Max)
Physical Specifications
Formatted Capacity	320,072 MB
Capacity	320 GB
User Sectors Per Drive	625,142,448
Physical Dimensions
English
Height	0.374 Inches
Depth	3.94 Inches
Width	2.75 Inches
Weight	0.26 Pounds
Metric
Height	9.5 mm
Depth	100.2 mm
Width	69.85 mm
Weight	0.117 kg
Environmental Specifications
Acoustics
Idle Mode	24 dBA (average)
Seek Mode	0 26 dBA (average)
Temperature (English)
Operating	32° F to 140° F
Non-operating	-40° F to 149° F
Temperature (Metric)
Operating	-0° C to 60° C
Non-operating	-40° C to 65° C
Humidity
Operating	8% to 95% 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	0.00459 g²/Hz (10 to 500 Hz)
Non-operating	0.05102 g²/Hz (10 to 500 Hz)
Electrical Specifications
Current Requirements
Read/Write	500 mA
Idle	400 mA
Standby	50 mA
Sleep	20 mA
Power Dissipation
Read/Write	2.50 Watts
Idle	0.85 Watts
Standby	0.25 Watts
Sleep	0.10 Watts

As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, megabit per second (Mb/s) = one million bits per second, and gigabit per second (Gb/s) = one billion bits per second. 

http://www.wdc.com/en/products/products.aspx?id=140

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