New Full Clone
I renamed a partition on external drive the same as the internal HD and did a full backup-all files. I then booted from the Full Clone. Disk Utility still unable to unmount the internal hd. Assuming that there are no other problems than this unmounting one, I will not try any other work arounds at the moment. When I do want to repair the disk on the internal hard drive, I'll do it in single user mode with AppleJack.
Now with OS X 10.4.1 released this morning, the process may start all over, all nothing in the news of the update mentions this problem and I have yet to hear back from my bug report to Apple.
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