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When I sync two folders between two HDDs, rsync only lists the changes made at the end.

However if I sync a folder between a HDD and an external HD, while the sync is running it is listing each directory where it gets in. So at the end I have a "dirty" log about tasks made and I have to be filtering it.

I would like to have a clean log also when syncing with the external HD, any idea?

I'm using -av --delete.

Examples where both directories are the same already:

  • HD to USB:

    rsync -av --delete A/ /media/USB/E/
    sending incremental file list
    sent 102 bytes  received 27 bytes  258.00 bytes/sec
    total size is 0  speedup is 0.00
  • HD to HD:

    rsync -av --delete A/ /media/DATA/E/
    sending incremental file list
    sent 90 bytes  received 15 bytes  210.00 bytes/sec
    total size is 0  speedup is 0.00
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What filesystem are you using on the external drive? Is it FAT? It has poor timestamp resolution so probably rsync is seeing the different timestamp on the directory, and trying to update it. – psusi Jan 21 '13 at 15:30
FAT32 (USB) and NTFS (external HD). Both HDDs are in EXT4. – Ay0 Jan 21 '13 at 15:31
quick guess: permissions differs on FAT? – gelraen Jan 21 '13 at 16:14
In the second example, nothing was copied. The data sent was just file list data for comparison. – jordanm Jan 21 '13 at 16:53
Read what I said.. "Examples where both directories ARE THE SAME already". The second option is right, nothing has to be copied. The first one should be like the second, but it isn't, and that's what I'm asking about. – Ay0 Jan 21 '13 at 16:57

rsync has got an option called --modify-window=NUM which you can use to reduce the accuracy of time-stamp comparison. Try it with --modify-window=1. The option was created for exactly this purpose.

rsync may also try to fix other metadata, like file ownership, which is lost on FAT32 and friends, so you may still have issues even when using --modify-window=1

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Your USB fat32 partition doesn't handle all the metadata. Instead of -av try -rv.

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