Seagate ST3500630A 500GB UDMA/100 7200RPM 16MB IDE 3.5-Inch Hard Drive Seagate ST3500630A 500 GB IDE Hard Drive General Features: 500 GB formatted capacity UDMA/100 data transfer rate 7200 RPM spindle speed 16 MB buffer 4.16 ms average latency &lt;11 ms random seek time (read) &lt;12 ms random seek time (write) E-IDE/ATAPI interface Regulatory Approvals: CE UL TUV C-Tick BSMI MIC