HITACHI Deskstar 7K500 Internal Hard Drive H3500B72P 500GB - Can store up to 56 hours of HDTV broadcast, or 125,000 high quality, 4 minute MP3 recordings or a whole lot of data (500 GB = 500,000,000,000 bits of information) Internal PATA interface Fast access with up to 7200 RPM rotational speed For Desktop installation in a PC with available 3.5 Hard Drive internal bay