Hmmm. As far as I remember, I did! Don't have the machine here so I can't check.
I bought an external drive case and the 320GB drive, used Disk Utility to partition it into System (80GB) and Data (the rest). Then used CCC to copy the original drive to System. Then booted from the new drive to make sure all was OK. Swapped the drives and copied my data /User/mac over to Data and then changed the pointer in whatever it is to point to /Volume/Data/mac. Changed the name of the original /User/mac to /User/mac.old (for deletion later if all is OK).
Rebooted and all seems fine. But I'll recheck tomorrow at work.
Thanks for heads up!
Mac
(bit of a PITA physically changing drives in the Mac Mini)