This Western Digital 320GB internal desktop drive is a great addition to any PC setup. Its 3.5" form factor and SATA interface make it compatible with most PCs. With a rotation speed of 7200 RPM and 8MB cache, it provides fast and reliable storage for all your files. The hard drive is in good working order and has been tested for functionality. The WD3200AAJS-22L7A0 model is from the Caviar Blue series and comes in HDD format only. This hard drive is ideal for those looking to upgrade their storage capacity or replace an old drive. Its compatibility with PCs, high rotation speed, and large cache make it a reliable and efficient option.