Yes, it's possible to just copy the data over to the new drive, and then rename the partitions once the old drive is gone. I did this recently going from a 60GB to 120GB drive. I used the shell command COPY while booted without Workbench (to ensure there were no files in use, although I don't know if it was necessary). IIRC, the arguments were something like C:COPY SYS: SYS_NEW: ALL CLONE.
