Western Digital WD2500SD 250GB Hard Drive Western Digital Caviar RE 250 GBSATAHard Drive General Features: 250 GB formatted capacity 7200 RPM spindle speed 8 MB buffer Serial ATA (SATA) interface 150 MB/s data transfer rate 8.9 ms average seek time 4.20 ms average latency 3.5-inch form factor Regulatory Approvals: UL CE C-Tick BSMI MIC