Things don't work the way you think. They are much, much more complex.
E.g. a full NTFS driver implementation requires more than 150 person
years work.

Not only the file data but ALL relevant metadata must be on the disk as
well. If only a few metadata bytes are missing then one may "lose"
everything, or some files, or part(s) of a file or nothing. It depends
on what part of the metadata was not flushed to the disk. This is the
reason why a recovery software can recover files by scanning the entire
disk. Most files are there but the pointers to them are not correct and
they are not visible and accessible by the user.

-- 
file move causes data loss if interrupted due to system crash
https://bugs.launchpad.net/bugs/303610
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