Western Digital Western Digital 500GB WD Blue SA510 SATA Internal Solid State Drive SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS500G3B0A $49.99
Western Digital Western Digital Black 500GB Internal 7.2K RPM SATA 2.5'' Hard Drive - WD5000LPSX $29.99
Western Digital Western Digital Blue 5400 RPM, 2.5", SATA III, 128MB Cache 500GB Internal HDD - WD5000LPZX $29.99