on the new dvrme can you get say a 10 channel unit with 80 gigs and then install 640 gigs or more? in other words are the power supplys inside the unit the same whether your getting 80 or 640 gigs. i think the drives up to four of them need to be 5400 rpm drives.

Did you do a search on the forum?

I know something about hard disk expansion has been dicussed before.