Western Digital Caviar Blue WD3200AAJS 320GB 7200 RPM 8MB Cache Sata 3.0Gb/s 3.5" Internal Hard Drive. The Western Digital Caviar SE Hard Drive is a leader in the race for the peak of desktop drives. Its 320 GB runs at 7200 RPM, and its breakthrough 8 MB cache makes this hard drive great for high-performance home and business computing. It can handle data-intensive and high-end multimedia applications, offering an average 4.2 ms latency with an average 8.9ms seek time. An average write time of 10.9ms, results in both greater efficiency and safer data transfer. 
This hard drive incorporates WD’s Data Lifeguard, an exclusive set of data protection features, including shock protection, environmental protection, real-time embedded error detection and repair. Its mechanism ensures automatic discovery, isolation, and repair of problems which may develop in a hard drive.
 

Specifications:

Brand: Western Digital 
Series: Caviar Blue 
Model: WD3200AAJS 
Device Type: Hard drive - internal 
Width: 4 inches 
Depth: 5.787 inches
Height: 1.028 inches
Capacity: 320 GB 
Interface: Sata 3.0Gb/s  
Buffer Size: 8 MB 
Compliant Standards: S.M.A.R.T. 
Drive Transfer Rate: 300 MBps (external) 
Seek Time: 8.9 ms (average) / 21 ms (max) 
Track-to-Track Seek Time: 2 ms 
Average Latency: 4.2 ms 
Average Seek: Time 8.9ms 
Average Write: Time 10.9ms 
Spindle Speed: 7200 rpm 
Start / Stop Cycles: 50,000 
Interfaces: 1 x Serial ATA-300 - 7 pin Serial ATA
Compatible Bays: 1 x internal - 3.5" x 1/3H