1. Press Release Source: Western Digital Corp.
Wd(R) Ships 320 Gb Capacity 2.5-Inch Hard Drives for
Notebooks and Portable Storage Devices
Wednesday October 31, 8:01 am ET
WD's Continued Investments in Technology Result in Capacity Leadership
for the Mobile Market
LAKE FOREST, Calif., Oct. 31 /PRNewswire-FirstCall/ -- Western Digital Corp. (NYSE: WDC - News)
today announced it is now shipping its new WD Scorpio® 320 GB 2.5-inch SATA (Serial ATA) hard
drives for notebook computers and portable storage devices.
WD 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. 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.
"Consumer demands for high capacity storage are stronger than ever. WD is again leading the
industry by delivering high quality, high capacity product to the market with the introduction of its new
WD Scorpio 320 GB hard drive," said Campbell Kan, vice president of mobile computing business unit,
Acer Inc. "WD understands the increasing storage requirements of the notebook market, allowing Acer
to introduce high-capacity notebook solutions that meet our customer's ever-growing demands."
"In today's market, new notebook systems are increasingly targeting heavy duty applications in the
office and home," said Jim Morris, WD's vice president and general manager of notebook storage. "As
system manufacturers improve performance and add data hungry features, high-capacity hard drives
become a key ingredient that allows users to fully benefit from the latest computing technologies."
The WD Scorpio 320 GB SATA hard drive is a direct result of the significant investments WD has
made in proprietary head technologies. With the introduction of its latest-generation WD Scorpio
drives, WD continues to offer mobile computing and portable storage customers the same outstanding
quality, reliability and performance that have earned the company a leadership position in the desktop
PC 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.
WD Scorpio Exclusive Features
WhisperDrive(TM) -- WD's exclusive WhisperDrive technology combines
state-of-the-art seeking algorithms to yield the WD Scorpio 320 GB as one
of the quietest 5400 RPM, 2.5-inch drives available.
ShockGuard(TM) -- Leading-edge ShockGuard technology combines firmware and
hardware advancements to protect the drive mechanics and platter surface
to meet the highest combined shock tolerance specifications required for
mobile and notebook applications.
IntelliSeek(TM) -- Another unique WD Scorpio 320 GB feature is its
IntelliSeek technology, which calculates optimum seek speeds to lower
power consumption, noise and vibration.

2. WD Scorpio delivers best-in-class performance with low power consumption and cool operation. In addition, you'll
get one of the quietest 2.5-inch drives on the market with real-time data protection technology to help keep your
data safe.
Key Features
Massive capacity - Whether they are in an external drive or a notebook computer, WD’s 320 GB 2.5-inch drives
offer the most available capacity for space-hungry operating systems like Windows Vista™, plus plenty of room left
over for photos, music, and video.
Fast and Efficient - With 5400 RPM spin speed and 12 ms access time, even the most demanding customer will
appreciate the performance achieved by WD Scorpio drives.
Quiet - In a notebook drive, silence is golden. WD’s exclusive WhisperDrive™ combines state-of-the-art seeking
algorithms to yield one of the quietest 2.5-inch hard drives on the market. These algorithms also optimize the way
a drive seeks for data, which significantly improves power consumption. So now silence (and longer battery life) is
golden.
Reliable and Rugged - WD's ShockGuard™ technology protects the drive mechanics and platter surfaces from
shocks. WD's SecurePark™ parks the recording heads off the disk surface during spin up, spin down and when
the drive is off. This ensures the recording head never touches the disk surface resulting in improved long term
reliability due to less head wear, and improved non- operational shock tolerance.
Tested for Compatibility - We perform tests on hundreds of systems and a multitude of platforms in our FIT Lab
and Mobile Compatibility Lab to give our customers confidence that our drives will work in their systems.
Ideal For
Portable digital devices of all kinds, including notebook computers, external storage, and digital media players.
Important interface information
This drive requires a SATA interface
[WD Interface Guide]
Up to 91,000 digital photos
Up to 80,000 songs (MP3)
Up to 8,000 songs
(uncompressed CD quality)
Up to 24 hours of Digital Video
(DV)
Up to 100 hours of DVD quality
video
Up to 38 hours of HD video

3. 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

4. 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)

5. 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