...if you're thinking about merging partitions on your harddrive:
BACKUP!
Just lost two partitions worth of data; quite a bunch of applica-
tions, my beloved Dilbert episodes, all my Star Trek movies (for-
tunately I have been able to get these from otherwhere), a
bunch of pictures I really didn't want to lose, and the list goes
on. I've done it before, the merging - without any data ending
up being corrupt and unrecoverable (believe me, I tried many
things to try to recover it, but only like 0.5% (or less) succeed-
ed) - but thanks to a bad block on the drive, it failed

!