The 160GB drive is soon to be upgraded to a 128GB SSD
currently on a gap year so work machine is on the 160, personal/bootcamp is on the 1TB.
The work machine will remain on 128 as that's where I do anything that requires most speed, but when I leave and go to uni it will become my boot drive with the 1TB being for data
Sort of hoping apple lets us use fusion drive on aftermarket drives, although I REALLY doubt it, and tbh I'm about 50/50 as to whether I'd actually like it! (can't tell without trying tho eh!)