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Does mv on a FAT filesystem actually rename or does it copy and delete?

On Sat, Feb 03, 2018 at 09:14:39AM -0500, Little Girl wrote:
> Hey there,
> Chris Green wrote:
> > I want to rename some picture files on a mounted digital camera
> > filesystem.  It is a VFAT filesystem.
> > 
> > If I rename one of the files using 'mv <xxxx.yyy>' will the file
> > *actually* be renamed by changing the directory entry only or will
> > mv copy the file to one with the new name and then delete the old
> > one? 
> This page might be useful:
> https://unix.stackexchange.com/questions/149795/move-preserves-ownership-of-source-files-not-allowing-writes 

It doesn't really address my issue which is whether mv will work the
same on FAT/VFAT as it does on 'native' Linux filesystems.

Chris Green