HD WD CAVIAR XL WD400JD 40 GB SATA/150 7200 RPM, 8MB cache

Rotational Speed 7,200 RPM (nominal) Buffer Size 8 MB Average Latency 4.20 ms (nominal) Contact Start/Stop Cycles 50,000 minimum Seek Times (Average) Read Seek Time (Average) 8.9 ms Write Seek Time (Average) 10.9 ms (average) Track-To-Track Seek Time 2.0 ms (average) Full Stroke Seek 21.0 ms (average) Transfer Rates Buffer To Host (Serial ATA) 1,200 Mbits/s (Max) Buffer To Disk 748 Mbits/s (Max)