Well this problem is certainly not unique to SuperDuper!. Other programs which clone the internal hard drive to my external firewire drive result in the same problem, namely TechTool Pro 4.0.4 (Tiger compatible) and Data Backup 2.0.5 (Tiger Compatible). None of them (and SuperDuper!) had any difficulty producing clones with Panther. With Tiger, all of them create clones which make Disk Utility unable to check the internal hard drive because of bug in unmounting the drive.
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