Once you put new songs onto your iPod, the songs become synced with all of the other songs on your iPod, and any new songs you have on your hard drive are added to your music library. This is only done if you don't manually control your iPod and you have it automatically update to find new songs on your computer. You can sync songs from your computer at any time by clicking on the "Sync" button from the "Summary" tab of your iPod in iTunes. The best way to not disrupt your playlists or songs already in your library is to play and add songs manually without syncing.
Instructions
1. Connect your iPod to your computer using the USB cord. Itunes will pop up and you should see your iPod displayed. Click on the iPod icon under the "Devices" heading.
2. Click on the "Summary" tab and then check the box next to the "Manually manage music and videos" option. Click on the "Apply" button to save this change. The content of iTunes and the iPod are now separate and will no longer sync.
3. Play songs on your iPod through iTunes to test that the manual mode is working properly. Songs from your iTunes library will also not become updated into your iPod. So, if you want to add a song you must drag it from your iTunes library or from where it's stored on your computer to the iPod icon in your iTunes.
4. Delete any song on your iPod manually by right clicking on the song while in your iPod and clicking on the "Delete" option. If you delete a song it will be gone forever, unlike when your iPod was synced with iTunes.
5. Disconnect you iPod carefully by clicking on the "File" option and "Disconnect iPod". If you're using a Mac, you can drag the iPod icon into your Trash to have it disconnect. Before when the iPod and iTunes were synced you didn't need to do this, but now you need to make sure to use one of these disconnecting methods so that you don't lose any data. The next time you connect your iPod you'll still be in manual mode and be able to listen to all of your songs without syncing.
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