>I an not impressed by Disc Utilities.
No utility can fix this kind of damage.
An extent allocation file is a way to keep track of files that are fragmented.
When you save a file on disk, the file does not necessarily all get stored in
the same place. Part of the file might be in one place, part of the file in
another place, part of the file in another place still.
Each part is called an "extent."
"Overlapped extents" means that you have two files (or more) that have pieces
which were both saved on the same spot of the disk. This means, one file has
overwritten part of the other. This means at least one file, and possibly more,
The computer can not tell which file is damaged and which file overwrote the
other; therefore, the computer can not fix this problem.
A commercial disk repair program like DiskWarrior will tell you the names of
the files, so that you can open the files and see which ones are ruined. But
nothing can fix the files. You have already lost data; if you do not use a
commercial program to locate and delete the offending file(s), you will almost
certainly lose more data.
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