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Is there a way to make Total Commander show file sizes in "size on disk" instead of actual bytes in file?

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None that I know of. The „size on disk” column is just Explorer’s rough estimate. – kinokijuf Aug 28 '12 at 14:18
@kinokijuf: But it doesn't have to be. The filesystem does provide this information to programs. – grawity Aug 28 '12 at 16:36
A good description of the difference between size on disk and file size:… – Assad Ebrahim Sep 5 '12 at 2:02

Use Ctrl+L (File > Calculate Occupied Space...).

This works on files as well as directories and shows both file size and size on disk.

Example: for the small file (26 bytes) in the totalcmd directory, you can see that it occupies 4K of space on disk -- i.e. that the Windows 7 filesystem uses 4K clusters.

Screenshot showing result of running Calculate Occupied Space command

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