I decided to start this thread because the Humax and Toshiba threads seem to be rather popular. I have several of the DVR-810H-S model (see my sig) and one of the DVR-57H model. I love them! They are very solid units. And having TiVo Basic doesn't hurt either. The hard drive upgrade process is very straight forward. There is really only room for one hard drive, but I've heard some people have been able to squeeze a second hard drive in it. Since these units have two IDE channels, it would be interesting to see if someone could squeeze three or even four hard drives into one unit. The DVD writer would have to be removed, however. Maybe I'll try this to see if it will work. Unfortunately, I haven't been able to successfully replace the DVD writer, in case the writer fails. I think there is something special about the firmware in the writer. I have tried replacing the writer with a Pioneer DVR-105, Pioneer DVR-106, Pioneer DVR-107, Pioneer DVR-108, and Pioneer DVR-109. Each time I've tried, I can play DVDs, but I can't burn DVDs. But anyway, owners of a Pioneer TiVo, sign in and be counted!