I filled up my internal hd's, a 30gb, and a 60, i wanna put in two 120's, but keep the info, how can i do this? can I put the first 120 as a the mian, then the 30 which has system info as the second, copy info, then swap that for the 60, swap info, then swap in the 2nd 120? also, how would i "swap" the info