WD  WD3200KSRTL Caviar 320 GB SATA 3.5-Inch Hard Drive 320 GB SATA 3.5-inch internal hard drive for capacity-hungry applications 7200 RPM spin rate; 16 MB cache; 300 MB/s transfer rate WhisperDrive technology minimizes noise; SoftSeek technology increases operational efficiencies Designed for low-power consumption Data Lifeguard Tools protect data; ShockGuard protects hard drive; 3-year limited warranty