I know that back when the HR20 21,22,23 came out, that all you had to do is replaced the internal hard drive with a larger capacity, fire up the receiver and the receiver formatted the drive and you were up and running. I wonder if the THR22 will do the same? Anybody have any info on this? I know that there is a warranty seal on the back, but not worried about that. Don't want to deal with an external drive as the unit draws enough power as it is. Don't want to have another 15 or 20 watts of power spinning the meter 24/7. I guess I could just install one and see what happens, the worst that can happen is it doesn't work, and would have to put the original drive back in.