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Date: Sun, 14 Sep 2008 19:45:46 +0100
From: "Chris January" <chris AT atomice DOT net>
To: cygwin AT cygwin DOT com
Subject: Re: Rsync and NTFS -> FAT32 problem
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On Sat, Sep 13, 2008 at 8:01 PM, Richard Ivarson wrote:
> Hello,
>
> I use Rsync successully to sync, for example, a NTFS formatted WinXP PC
> (where Cygwin's Rsync runs) with a Linux PC, and to sync the Win-PC with
> a <n> GByte USB memory stick.
>
> When the memory stick is formatted to NTFS all works fine (exact command see
> below please).
> But since I formatted the memory stick to FAT32 because it's more usuable on
> Linux PCs, suddenly the very same Rsync command shows different results! It
> copies many files from the Win-PC to the USB stick which already are up to
> date...
> I couldn't figure out what these files have in common... or why Rsync would
> get wrong information from the FAT32 filesystem...
>
> In the end I tried the Rsync parameter "--checksum" which solved the
> problem,
> but slows down the whole thing a lot.
> Then I found the "--update" parameter which does the trick, too. OK, so it
> prints many directories which "--checksum" did not print, but ... it's
> rather
> optical.
>
> The command is :
> * rsync --delete --update --relative --recursive --times --progress
> Sourcefolder/ /cygdrive/u/Destinationfolder
>
> Using parameters like "--owner" or "-permission" didn't help.
>
> Does anybody know what is the problem with FAT32 (and Rsync using it) ?
> Thanks.

FAT32 only has 2 second file modification time granularity. You need
to pass the --modify-window option to rsync.

Chris

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