WDC 3,5" 250 GB Sata 7200 Rpm 8 MB

WD Caviar Blue 250 GB PATA Hard Drives ( WD2500AAJB)

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

Transfer Rates
	Transfer Rate (Buffer To Disk)	126 MB/s (Max)

	Buffer to Host (EIDE)
	Mode 5 Ultra ATA	100 MB/s

Physical Specifications
	Formatted Capacity	250,059 MB
	Capacity	250 GB
	Interface	PATA 100 MB/s
	User Sectors Per Drive	488,397,168

Physical Dimensions
English
	Height	1.028 Inches
	Depth	5.787 Inches
	Width	4.00 Inches
	Weight	0.95 Pounds

Metric
	Height	25.4 mm
	Depth	147 mm
	Width	101.6 mm
	Weight	0.43 kg

Environmental Specifications
Shock
	Operating Shock (Read)	30G, 2 ms
	Non-operating Shock	350G, 2 ms

Acoustics
	Idle Mode	29 dBA (average)
	Seek Mode 0	30 dBA (average)
	Seek Mode 3	30 dBA (average)

Temperature (Metric)
	Operating	-0° C to 60° 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	0.008 g²/Hz (10 to 300 Hz)
	Non-operating	0.05 g²/Hz (10 to 300 Hz)

	Operating
	Linear	20-300 Hz, 0.75G (0 to peak)
	Random	10-300 Hz, 0.008 g² / Hz

Electrical Specifications
Current Requirements
	12 VDC
	Read/Write	270 mA
	Idle	250 mA
	Standby	6 mA
	Sleep	6 mA

	5 VDC
	Read/Write	550 mA
	Idle	460 mA
	Standby	170 mA
	Sleep	170 mA

	Power Dissipation
	Read/Write	5.99 Watts
	Idle	5.18 Watts
	Standby	0.66 Watts
	Sleep	0.66 Watts