Bought one of these units. Believe I was able to successfully upgrade the harddrive. Dropped in a 200 Gig PATA IDE drive. Unit stopped typical startup process and prompted to format the harddrive. Screen went blank during format, but seemed to work. Unfortunately, I didn't bother to check recording times available before upgrade. But with the 200 Gig drive in the unit, I have 58hrs 36 mins recording time at best quality (1), 130 hrs, 8 mins at Good Quality (3), and 262 hrs 56 mins at Basic Quality (5).
I am disappointed at all the Copyright crap in it. Can't dump a commercial DVD to the harddrive for archiving. Can't even capture anything commercial from the analog video inputs. I even tried my old Macrovision remover box on the video in, it somehow still knew I was paying back a commercial DVD. I was hoping to use this as a video jubebox for my DVD collection.
Next step is to convert my movies to MPEG2 files, burn to DVD, and see if it will recognize them and allow copying to the internal harddrive.