I currently have a HR20/700 with an external 750GB hard drive that I was wanting to add more recording capacity to. At first I was just going to get a bigger drive but then while shopping at the computer store I saw an external drive case that will except 2 drives and run in JBOD mode. My question is if I get this case and make my current drive the first drive and then add a second drive will the DVR format it and use the additional space? Has this ever been done? I searched the forums a little but didn't fine any information about anyone trying this so I apologize if this has been posted. However if it's never been tried I would be more than willing to try it.