Ye I was also wondering what kind of HD it houses. I remember seeing somewhere on the web its dissembly, but at the time I did not own one. I have not run out of space because I keep my vids on when I travel and put new ones when I go for the next one.
I took mine apart this afternoon, boy it has one of the smallest ribbon connectors inside I have ever dealt with. The harddrive is A MK2004GAL so our options are limited, I would like to install a MK4006GAL or now I guess it is a MK4007GAL.