So I have been using a western digital caviar green for awhile now that is 2 tb's....these are pretty slow drives, and I believe it is dying on me, so I bought a copy of windows 7, an SSD, and some 2tb 7200rpm HDD to sort of replace it, although I would like to move everything that I really want to the new HDD, but I can't imagine having 2 instances of windows going at the same time is a very good idea....