"gparted" is an open-source program that you'll burn to a cd, then you can resize your partitions without wiping anything out. Yeah, ya still gotta have the 2.5 to 3.5 cable, and DISCONNECT ALL YOUR HD's in your pc before running DBAN!!! Leave only the new hd connected. Both programs (gparted & DBAN) to lobotomize & resize your 2.5.
"DBAN" (Darik's Boot And Nuke) will totally wipe out EVERYthing on a drive, including data in "sector 0" (where the hd reads its lock code from. After running DBAN, load your d/l'ed z2 image into it.
Google for the 2 prog's above, enjoy...
...j