The Caviar SE16 WD7500AAKS is the top of the line high capacity (750 GB) drive from Western Digital. The drive uses a four platter desing with 16MB of buffer, which is the norm in this segment. Like other Western Digital drives, the WD7500AAKS implements SecurePark and ItelliSeek for improved shock tolerance in powered off mode and improved

power management respectively.
The cost per GB comes to about $0.40 which is good enough. The Price of $299 is a little too high for those who are looking to update specious secondary drive, though its a decent purchase as a primary hard drive.
We have compared this drive and the Segate Barracuda ST3750640AS (750 GB). The Caviar SE16 WD7500AAKS is a clear winner.

Tests
Assorted 4GB file Read (sec) WD7500AAKS 72.12 ST3750640AS 77.2
Assorted 4GB file Write (sec) WD7500AAKS 63.5 ST3750640AS 71
Drive Index (MB/sec) WD7500AAKS 79 ST3750640AS 64

Specifications:
Memory : 750 GB
Speed : 7200 rpm
Buffer : 16MB
Weight : 0.63 Kg
Dimensions : 147mm x 101.6mm x 25.4mm (W x D x H)
Port : SATA 2