Western Digital WD1500ADFDRTL Raptor 150 GB 3.5-Inch SATA Hard Drive Ultra-fast 150 GB 3.5-inch SATA internal hard drive designed for the enterprise environment 10,000 RPM spin speed; 1.5 Gb/s data transfer rate; 16 MB cache 1.2 million hours MTBF; extremely reliable performance Holds up to 42,000 digital photos; 37,000 MP3 files; 3,700 uncompressed CD-quality songs; 11 hours digital video; 66 hours DVD-quality video; 18 hours HD video 5-year limited warranty