Run iTunes and as you do so, hold down "Shift+CTRL" (Windows) or "Command+Option" (Mac), in order to prevent your iPod from automatically syncing.
Choose your iPod's name in the source panel. Notice that "Summary" view appears in the main panel.
Click the square next to "Manually manage music and videos" to turn on manual mode, and then click the "Apply" button to save the changes. iTunes will no longer automatically sync and delete music off your iPod.
iTunes includes two basic synchronization options: automatic and manual. Automatic syncing means that your iPod immediately begins syncing all media to your computer when you plug it in. Unfortunately, this can delete media off your iPod, because your iPod will synchronize exactly to the media files you have on your computer. So if you've deleted media files from iTunes on your computer, those files will delete off your iPod as well--when it's in automatic sync mode. That's why many iPod users turn on manual mode, because it prevents iTunes from deleting data off of the iPod automatically during a sync.
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