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
	Interface	SATA 3 Gb/s

Physical Dimensions
English
	Height	0.374 Inches ±0.008 inch
	Length	3.94 Inches ±0.010 inch
	Width	2.75 ±0.010 inch
	Weight	0.26 Pounds

Metric
	Height	9.5 mm ±0.20 mm
	Length	100.2 ±0.25 mm
	Width	69.85 ±0.25 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	8-90% 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	0.00459 g²/Hz (10 to 500 Hz)
	Non-operating	0.05102 g²/Hz (10 to 500 Hz)

Electrical Specifications
Current Requirements
	5 VDC
	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, and gigabit per second (Gb/s) = one billion bits per second.

3 year limited warranty through Western Digital.