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From: Rodolfo Medina on 12 Aug 2010 15:10
Rodolfo Medina <rodolfo.medina(a)gmail.com> writes:

> When using rsync from pc to usb stick, it re-syncs unmodified files, which is
> annoying with large backups.
>
> In rsync man page, I found the following:
>
> When transferring to FAT filesystems rsync may re-sync unmodified
> files. See the comments on the --modify-window option.
>
> And, the comment on the --modify-window option:
>
> --modify-window
> When comparing two timestamps, rsync treats the timestamps as
> being equal if they differ by no more than the modify-window
> value. This is normally 0 (for an exact match), but you may
> find it useful to set this to a larger value in some situations.
> In particular, when transferring to or from an MS Windows FAT
> filesystem (which represents times with a 2-second resolution),
> --modify-window=1 is useful (allowing times to differ by up to 1


It is explained here:

http://www.samba.org/rsync/FAQ.html

Another common cause involves sending files to an Microsoft filesystem: if
the file's modified time is an odd value but the receiving filesystem can
only store even values, then rsync will re-transfer too many files. You can
avoid this by specifying the --modify-window=1 option.

and confirmed here:

http://ubuntuforums.org/showthread.php?t=886048

Apart from the fact that I can't understand how it's possible for a filesystem
to be unable to store odd numeric values!, the ls command with the --full-time
option shows to me that the timestamps are identical on both the source and the
destination: so, how can this odd-even difference be detected?

Contributes welcome
Rodolfo


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