Product Information:

250 GB, 300 MB/s, 8 MB Cache, 7200 RPM. Cool, quiet operation, superior performance and industry-leading reliability make these SATA drives ideal for desktop, business, and consumer electronics storage. Model WD2500JS.

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	250,059 MB
	Capacity	250 GB
	Interface	SATA 300 MB/s
	User Sectors Per Drive	488,397,168

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 g² / 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