WD AV-GP 500 GB AV Hard Drive: 3.5 Inch, SATA II, 32 MB Cache (WD5000AVDS) (Old Model) Power-conserving WD AV-GP drives offer significant power savings and thermally optimized operation resulting in lower cost of ownership and unsurpassed reliability for PVR/DVR, IPTV boxes and media server manufacturers. SilkStream - Optimized for smooth, continuous digital video playback of up to twelve simultaneous HD streams. SilkStream is compatible with the ATA streaming command set so CE customers can use standard streaming management and error recovery options. Ideal for set-top boxes (PVR, DVR and IPTV), media servers, media centers, and surveillance applications. 500 GB capacity holds up to 100,000 digital photos, 125,000 MP3 files, and 60 hours of HD video. 3 year limited warranty