Today I would like to offer an article that I hope will come in handy for others like me who have faced (or will face) a transition to a different Apple device, perhaps an iPhone 4S abandoning their 3GS (here I am, this!).
Today we talk about one of the most "unexplained" of his own memory (not more) of clearance is the one assigned to "other," which iTunes displays in the bar located at the bottom of occupation in the main window dedicated to the phone when connected.

And if the above image is drawn directly from the jaws of good Google, below the monster instead taken to my iTunes, the day after the purchase of my iPhone 4S and - consequently - the migration of data from iCloud first made , then from iTunes, and reiterating the concept premise (which many still do not know or do not believe possible) that restore from iCloud does not call your old songs in the new iPhone, the need for armed iTunes necessarily of your music library.
Ben 14 GB of "other" unspecified but mostly not accessible, inconceivable as yet unaccounted part of the application and all of my music.

With a little 'patience, some research on the web and my device as a guinea pig, I found a working method that allows you to put things in place, eliminating the first slice of memory dedicated to the "Other" (which ripopolerà then later in that portion of memory dedicated to the rescue of the applications and not only).

You ... will download and install a free software: iExplorer, available on the official website macroplant.com / iexplorer . The software is available for both Windows and OS X, so my article is "applicable" to both operating systems, as I will explain what is feasible now on independently from the OS. The best itunes cleaner disclaimer is a must, as always, eye to what you do!