Hitachi Deskstar P7K500 320GB UDMA/133 7200RPM 8MB IDE Hard Drive Hitachi Deskstar P7K500 320 GB UDMA/133 7200 RPM 8 MB Hard Drive General Features: Interface: IDE UDMA/133 Capacity: 320 GB Data Heads (Physical): 4 Data Disks: 2 Maximum Areal Density (Gbits/sq. in.): 185 Data Buffer: 8 MB Rotational Speed: 7200 RPM Media Transfer Rate: 1138 Mbits/sec, max Interface Transfer Rate: 133 MB/sec, max Advanced Power Management reduces power during idle periods