I think I know the answers to these questions,but want to be sure I have a handle on things. First,I have 2 receivers:an HR20-100 with and an HR20-700.The HR20-100 has a FAP 750 GB external eSATA that seems to be doing well after a years' use. About swapping hard-drives: (1)If the internal(OEM) drive fails on the HR20-100,can I remove the bare 750GB drive from the FAP and put it inside the DVR(will it recognize the drive,etc)?This would be mainly to not lose recordings by having to get a new DVR. (2)Can you take a HD that was previously used on a PC...i.e. formatted for a PC...and put it in the HR-100 internally(will it be formatted by the DVR after previous use)? (3) I assume a new drive(unformatted) can be put inside at any time? Thanks for any info on this!