im so scared i'll lose the content on my old ipod if i plug it into a computer... What can i do to load the music into my itunes and therefore have all music on just one device?
Put the music from your old iPod back into your iTunes so you can sync both devices (or just one) to the same library.
Be very careful when connecting an iPod full of music to an empty iTunes library (or a library not containing the music currently on your iPod).There is very real risk of permanently losing all the music.
To prevent auto sync,
before you connect the iPod go to iTunes/preferences and select "devices", then select "disable automatic syncing for iPhones and iPods".
An alternative method is to connect the iPod whilst holding down the 'Command + Option' keys and
do not let them go until your iPod appears in iTunes.
If you see a message that your iPod is associated with a different library and asks if you want to link to a new one, make sure you press
"Cancel".
If you should click on "Erase and Sync" will erase all the content currently on your iPod and it will be replaced with the content of the iTunes library you just connected to.
When you've pressed cancel your iPod should appear in the iTunes source list under "devices" and allow you to change the update setting to
manage the iPod content manually, and that will let you use your iPod for the time being without the risk of accidentally erasing the contents.
Then do any of the following to transfer your music from iPod back to the computer/iTunes.
Try
iPodDisk. This is a program designed to move music from iPod to computer.
Similar programs are
Expod,
Yamipod,
Senuti and
Music Rescue.
If you want to retrieve playlists,
iPodRip has the feature enabling you to reconstruct them.