WD VelociRaptor 450 GB SATA Hard Drives ( WD4500HLHX)

Performance Specifications
	Rotational Speed	10,000 RPM (nominal)
	Buffer Size	32 MB
	Average Latency	3.00 ms (nominal)
	Load/unload Cycles	600,000 minimum

Seek Times
	Read Seek Time	3.6 ms (average)
	Write Seek Time	4.2 ms (average)
	Track-To-Track Seek Time	0.4 ms (average)

Transfer Rates
	Buffer To Host (Serial ATA)	6 Gb/s (Max)

Physical Specifications
	Formatted Capacity	450,098 MB
	Capacity	450 GB
	Interface	SATA 6 Gb/s
	User Sectors Per Drive	879,097,968

Physical Dimensions
English
	Height	1.028 Inches
	Depth	5.787 Inches
	Width	4.00 Inches
	Weight	1.08 Pounds

Metric
	Height	26.1 mm
	Depth	147 mm
	Width	101.6 mm
	Weight	489 g

Environmental Specifications
Shock
	Operating Shock (Read)	65G, 2 ms
	Non-operating Shock	300G, 2 ms

Acoustics
	Idle Mode	30 dBA (average)
	Seek Mode 0	37 dBA (average)

Temperature (English)
	Operating	41° F to 131° F
	Non-operating	-40° F to 158° F

Temperature (Metric)
	Operating	5° C to 55° C
	Non-operating	-40° C to 70° 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, 0.75G (0 to peak)
	Random	10-300 Hz, 0.008 g2 / Hz

	Non-operating
	Low Frequency	0.05 g2/Hz (10 to 300 Hz)
	High Frequency	20-500 Hz, 4.0G (0 to peak)

Electrical Specifications
Current Requirements
	12 VDC
	Read/Write	320 mA
	Idle	210 mA
	Standby	5 mA
	Sleep	5 mA

	5 VDC
	Read/Write	470 mA
	Idle	360 mA
	Standby	130 mA
	Sleep	120 mA

	Power Dissipation
	Read/Write	6.20 Watts
	Idle	4.30 Watts
	Standby	0.70 Watts
	Sleep	0.70 Watts