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ITUNES NOT ONLY LETS you decide which songs and videos end up on your iPod, it also helps keep your iPod’s own internal software up to date, see how much space you have left on your player, and change your music, video, and podcast synchronization options.
When you connect your iPod to your computer, it shows up in the iTunes Source list (under Devices). Click the iPod icon to see all your options. Each tab at the top of the screen lets you control a different kind of content, like music or photos.
On the Summary screen (first tab), iTunes tells you:
The size of your iPod, its serial number, and whether it’s formatted for Windows or the Mac.
Whether your iPod has the latest software (and if you’re having problems, you get the chance to reinstall it).