Buffer Western Digital

Western Digital's 320GB HDD AV-25 is a 2.5-inch internal hard drive with a SATA 3Gbs interface and a speed of 5400 RPM. It has a buffer capacity of 16MB and is compatible with the WD AV MN500S-2 and WD3200LUCT models.

Western Digital (0718037858104 / WD8003FRYZ)

WD Red 2TB hard drive with 5400 RPM speed, 256MB cache, and SATA III interface. Designed for NAS systems and compatible with up to 8 drives. New and sealed.

The Western Digital Ultrastar DC HC580 is a high-capacity internal hard drive with a massive 24 TB storage capacity, 7200 RPM speed, and 512MB cache size.