Just like our computer hard drives, won't we need to defrag our HDD recorders to recover full disc capacity? My Panny E100 manual makes reference to how "the disc's available recording time may not increase after erasing short programs," but then doesn't offer a solution. It could be said that the frequency of writes and rewrites to our HDDs will be much less than on our computers, but shouldn't we be able to maximize the long-term utility of these babies. I will be programming at least two recordings daily, so my HDD use will get up there eventually.