"other" subdivision of my ipod hardrive?

i just synced my ipod just about 20 mins ago and suddenly its coming up that i have used 5.99gb on "other" what does that include? and i own added nothing more than a few songs thankfulness

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Answers:   

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It could be games, album art, manuscript documents, etc...
I think it may also include things you put on it if you use it as an external tricky drive. when i sync my ipod other is something that is not of the medium type listed (video audio photos) for example i hold donloaded some games to my ipod except they are stored in the "notes" folder and they are classed as other

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