iPod Classic 80 GB

How to add new songs to an iPod Classic 80 GB without removing old songs
Attach the iPod to your PC
Let it open iTunes application Once the iPod device is listed on iTunes application select the iPod device and make sure you check manually manage music and videos under the Summary tab.
Go back to your library and click and hold the album or songs you want to sync. Drag it over to where your device is listed and let it go. This should start the syncing process

Add Notes to iPod
Attach the iPod to your PC
Open notepad and write any text that you want to save on your iPod
Then go the Notes folder on your iPod and save the file (Give it a name)