If you've installed MyMedia Server to your Synology NAS, the first thing you'll likely notice is that there are folders called "@eaDir" everywhere on your system. This is a "hidden" folder where the server stores thumbnail files associated with iTunes support. Since we are not using iTunes, we do not need these folders!
To stop the folders from being created:
chmod 000 S66synoindexd.sh S77synomkthumbd.sh S88synomkflvd.sh S99iTunes.sh
To re-enable the folders being created:
chmod 655 S66synoindexd.sh synomkthumbd.sh S88synomkflvd.sh S99iTunes.sh
To delete *all* @eaDir folders on your system:
CAUTION: This will delete files without confirmation, so be sure you have it right!!
cd /volume1/music (or wherever your doc root is)
find . -name @eaDir -print | while read n ; echo $n ; rm -rf "$n" ; done
If you are copying files to the NAS from an Mac then sometimes @eaDir folders will reappear. When this happens, just re-run the above delete script to get rid of them.