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When I do an rsync to USB key using -t, it still copy a lot of file. Why?

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Your question is clear, -t is not expected to have an effect on the number of files copied. Are you referring to files being copied when they already exist on the target ? – João Pinto Nov 6 '10 at 8:08

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Some Microsoft filesystem can only store even values. Then rsync retransfer any file with an odd value.

You can avoid this by specifying the --modify-window=1 option

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