So you put two TB drives in and ended up with one TB of space? That’s just simple mirroring (raid 1) isn’t it?
Eventually at home I’m just going to pick up a couple 500GB drives, toss them in my desktop, and let windows mirror them for data integrity.
http://www.pcstats.com/articleview.cfm?articleid=830&page=5
In the mean time I just downloaded a cool little freeware sync program that I run every few days that automatically syncs my laptop and desktop so I have two copies of everything in My Documents.