AFAIK, there's no reason WD/TiVo won't have a 1TB drive available one of these days. WD says "late 2008" whatever that may mean. So if you can survive with what you have you should be fine. On the other hand, WinMFS is a real no-brainer and very, very easy to use. Our 1TB drive functions perfectly and all of our settings (SP's, WL's, etc.) transferred over just fine...including the cable card settings. So if you get antsy, give it a go. Worst case scenario is that if you somehow by some freak chance manage to muck things up (and I honestly don't know how anyone could), you can just reinstall your original drive and you're back to square one, no harm done.