The Specs

Interface
Interface Connection Serial ATA - 7 pin
Storage
Capacity 320 GB
Additional Specifications
normalized-Height 9.4996
normalized-Access Time 12
normalized-Weight 3.52
Height 0.374 in
Width 2.75 in
Depth 3.94 in
Host Transfer Rate 300 MBps (2.3 Gbps)
Access Time 12 ms
Quick Glance
Form Factor Width 2.5"
normalized-Cache Size 16
Drive Type Hard Drive
Internal/External Plug-in Module
Interface Type SATA
normalized-Rotational Speed 7200
normalized-Capacity 320000
Warranty
Warranty Information 5 Year
Dimensions
Weight 3.52 oz
Dimensions 0.37" Height x 2.75" Width x 3.94" Depth
More Info
URL http://www.wdc.com
Performance
Rotational Speed 7200 rpm
Cache Size 16 MB

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