Western Digital has launched its WD Scorpio 320 GB 2.5-inch SATA (Serial ATA) hard drives as well as its environmentally friendly, energy-conscious GreenPower family of WD enterprise hard drive products. The The new WD RE2 GreenPower (GP) family offers capacities of 500 gigabytes (GB), 750 GB and one terabyte (TB) while the Scropio is designed for notebook computers and portable storage devices.

The WD RE2-GP hard drives are designed with power savings as the primary attribute. The WD RE2-GP hard drives offer massive capacity with significant power savings and lower total cost of ownership compared to other competitive enterprise-class drives. The Scorpio on the other hand uses advanced head and media technology to achieve the world's highest capacity 2.5-inch, slim, 9.5mm form-factor hard drive and includes proprietary features that make the drive extraordinarily quiet while running at cool operating temperatures.

Read on for more.     

WD Scorpio Drives 

The WD Scorpio 320 GB hard drives deliver high performance with 3 Gb/s transfer rate and are destined for use in OEM notebook platforms that offer the highest storage capacities to the worldwide market. The new WD Scorpio drive further expands the company's breadth of 2.5-inch, 5400 RPM, mobile hard drive offerings to capacity points up to 320 GB. 

Performance Specifications
	Rotational Speed	5,400 RPM (nominal)
	Buffer Size	8 MB
	Average Latency	4.20 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)
	Transfer Rate (Buffer To Disk)	850 Mbits/s (Max)

Physical Specifications
	Formatted Capacity	320,072 MB
	Capacity	320 GB
	Interface	SATA 3 Gb/s

Physical Dimensions
English
	Height	0.374 ±0.008 inch
	Length	3.94 ±0.010 inch
	Width	2.75 ±0.010 inch
	Weight	0.26 Pounds
Metric
	Height	9.5 ±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	41° F to 140° F
	Non-operating	-40° F to 149° F
Temperature (Metric)
	Operating	5° 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	2.00 Watts
	Standby	0.25 Watts
	Sleep	0.10 Watts

GreenPower Drives

 GreenPower drives from WD deliver exceptional power conservation, run ultra-cool and quiet, while providing solid performance. The following technologies enable the WD RE2-GP platform:

* IntelliPower™ - A fine-tuned balance of spin speed, transfer rate, and caching algorithms designed to deliver both significant power savings and solid performance. Additionally, GreenPower drives consume less current during start up allowing more drives to spin up simultaneously resulting in faster system readiness.

* IntelliSeek™ - Calculates optimum seek speeds to lower power consumption, noise and vibration.

* IntelliPark™ - Delivers lower power consumption by automatically unloading recording heads during idle to reduce aerodynamic drag and by disabling read/write channel electronics.

* Active Power Management - WD GreenPower drives monitor work load and automatically invoke idle mode whenever possible to further reduce unnecessary power consumption. Drive recovery time from idle mode is less than one second, providing seamless communication between the drive and the host controller.

Performance Specifications
	Rotational Speed	IntelliPower *
	Buffer Size	16 MB
Seek Times
	Read Seek Time	8.9 ms
Transfer Rates
	Buffer To Host (Serial ATA)	3 Gb/s (Max)
	Transfer Rate (Buffer To Disk)	84 MB/s (Sustained)

Physical Specifications
	Formatted Capacity	1,000,204 MB
	Capacity	1 TB
	Interface	SATA 3 Gb/s
	User Sectors Per Drive	1,953,525,168

Physical Dimensions
English
	Height	1.028 Inches (Max)
	Length	5.787 Inches (Max)
	Width	4.00 Inches (+/- 0.010 inch)
	Weight	1.61 Pounds
Metric
	Height	26.1 mm (Max)
	Length	147 mm (Max)
	Width	101.6 mm
	Weight	0.73 kg

Environmental Specifications
Shock
	Operating Shock (Read)	65G, 2 ms
	Non-operating Shock	250G, 2 ms
Acoustics
	Idle Mode	24 dBA (average)
	Seek Mode 0	29 dBA (average)
	Seek Mode 3	25 dBA (average)
Vibration
	Operating
	Linear	20-300 Hz, 0.75 G (0 to peak)
	Random	0.004 g²/Hz (10 to 300 Hz)

Electrical Specifications
Current Requirements
	12 VDC
	Read/Write	340 mA
	Idle	254 mA
	Standby	6 mA
	Sleep	6 mA
	5 VDC
	Read/Write	675 mA
	Idle	195 mA
	Standby	180 mA
	Sleep	180 mA
	Power Dissipation
	Read/Write	7.4 Watts
	Idle	4.0 Watts
	Standby	0.97 Watts
	Sleep	0.97 Watts

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