"add folder to library" question ...

Firstly - I don't want to put all my music in the iTunes Media folder and let iTunes organise my libary - I like it the way it is.

So I've used the "add folder to library" function to add my music library from another location. I realise that iTunes won't monitor this folder so I just manually add my library folder each time I add music to it, and iTunes rescans the entire directory. Seems to work OK...

Is this creating duplicates or a hideously large library XML? Or does iTunes recognise if a file already exists and only add the new files to its library XML?

Thanks

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