ST9320329AS Seagate Momentus 320 GB 5.4K RPM 8MB Buffer 2.5 Inches Form Factor SATA 300 Notebook Hard Drive. New Sealed with Full Manufacturer Warranty.

Specification
Device Type Hard drive - internal 
Width 2.8 in 
Depth 3.9 in 
Height 0.4 in 

Hard Drive
Form Factor 2.5" x 1/8H 
Capacity 320 GB 
Interface Type Serial ATA-300 
Buffer Size 8 MB 
Features QuietStep, Native Command Queuing (NCQ), Ramp Load, Hardware Full Disk Encryption (FDE), Perpendicular Magnetic Recording (PMR), Seagate Secure 

Performance
Drive Transfer Rate 300 MBps (external) 
Internal Data Rate 103.8 MBps 
Average Latency 5.6 ms 
Spindle Speed 5400 rpm 

Reliability
Non-Recoverable Errors 1 per 10^14 
Start / Stop Cycles 600,000 

Expansion / Connectivity
Interfaces 1 x Serial ATA-300 - 7 pin Serial ATA 
Compatible Bays 1 x internal - 2.5" x 1/8H