I looked on the Tech Portal for information on connecting an external hard drive and they only mention a minimum size of 50 GBs. What is the maximum size that a 722 can recognize? I'm thinking of just buying an external enclosure with its own PSU and putting a Western Digital drive inside. Is there anything technical that I need to know before purchasing? I know it has to be a single drive. 7,200 RPM, I assume, will be fast enough. Any Cache size recommendations or other details to do with the drive itself? Thank you in advance!