Ubuntu 12.10: music disappearing

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http://androidforums.com – I have noticed that often songs i have downloaded via my laptop or phone and then transferred to my computer have managed to disappear. at first i thought it was just music on my laptop that i recently tossed out for being a real pain, but today i fired it up and five songs total were gone that were not the night before. fsck is not reporting anything wrong either. is there some kind of odd DRM at work that deletes songs if they are determined to be illegal or something? it seems to only affect files within my music folder itself, but those in 'downloads' are fine. although it does add unneces (General)