- Featuring: Western Digital WD6400AAKS 7200 RPM SATA 640 GB Internal Hard Drive Cache16 MB Specifications: Model WD6400AAKS Capacity 640 GB Drive Type Internal Hard Drive Form Factor 3.5 inch Interface SATA (3.0 Gb/s) Speed (RPM) 7200 RPM Cache / Buffer 16 MB Use Type Desktop storage.
eBay