Thanks for your replies!
Another situation-
I am trying SuperDuper to backup a disk that has some problems. (Disk Utility reported some problems, DiskWarrior reported the directory was too damaged to rebuild, Disk Utility repaired the problems and says the disk is OK, but DiskWarrior reports the directory is still too damaged to rebuild.)
Other verification tools (Synchronize! Pro X 3.6.1) is running into errors when comparing the original disk and the SuperDuper backup copy, so I cannot verify the backup completely. And yet, SuperDuper made the backup copy without reporting any errors, so I am trying to analyze and understand what data can be trusted here...
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