Existing users, 
iPartition
Disk partitioning without initializing or reformatting.
Version: 3.2.0
Won't try
Feedback Type: Commentary
Contributed by: ACBIV Friday, July 09 2004 @ 05:47 PM PDT
Product Platform: MacOSX
Used Product For: Have Not Tried
Can you imagine using iPartition or for that matter VolumeWorks (the competition) on an active disk without a full backup or clone of its content? If you have to do that, then the Disk Utility will look after you and you clone back. I have no reason to believe this won't work, I'm just not going to test it on a working boot disk and believe that it will still boot afterwards.
Won't try - ACBIV
Subsequent research has shown that this was extensively discussed here:http://forums.macrumors.com/showthread.php?s=&threadid=78561#post922178
Clearly, there can be problems that require a backup before you begin, and equally clearly, the iPartition folks are ready to help if you do have a problem.
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Friday, July 09 2004 @ 09:24 PM PDT