WD  500 GB Caviar Blue 100 Mb/s 7200 RPM 16 MB Cache Bulk/OEM Desktop Hard Drive - WD5000AAKB Ships in Certified Frustration-Free Packaging Speed: 7200 RPM Capacity: 500 GB 500 GB capacity holds up to 100,000 digital photos, 125,000 MP3 files, and 60 hours of HD video.