Just confirmed it today that FAILED iTunes Media syncs result in a very large "other space" category on the iPhone taking up disk space. After 2 years of using my iPhone the other space grew to 6.42GB's and unfortunately required a Restore as New from iTunes and after transferring all my apps and data to the iPhone I got back an extra 5GB's.
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MAJOR ITUNES iOS BUG
- Thread starter jwolf6589
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Also there was a bug in earlier versions of iOS 6 where message attachments were never deleted. Those orphan attachments could not be deleted even in later versions of iOS. But if you got socked with all that from a failed sync then ouch. 
Also there was a bug in earlier versions of iOS 6 where message attachments were never deleted. Those orphan attachments could not be deleted even in later versions of iOS. But if you got socked with all that from a failed sync then ouch.
That drove me nuts. It didn't really come to light until iOS 7 settings showed how much space each app was using. To add insult to injury Apple didn't implement a way to clear that data within settings.
Only options are to hack a back up and restore from it or restore as new.
I plan on doing it this weekend. I've been away from a computer I could do something like this on for nearly a year. It's even driving me nuts.