The drawback is that it probably won't work for everything (most people have music from CDs and other stores), but it can reduce the transferring you need to do in other ways.Start by signing the computer that will have the shared i Tunes library into the i Tunes account associated with the i Pod. If a window pops up with a "Transfer Purchases" button, click that.To include fields defined in files other than the first file, uncheck the “Ignore Fields not in the first file” checkbox.Not every household needs more than one computer running i Tunes.
Luckily, there are a number of methods--some free, some with small costs--that can make this process easier.Most don't transfer apps but, as noted above, you can always redownload apps to the new i Tunes library.Unlike the external hard drive method above, these programs let you retain star ratings, play counts, playlists, etc. (If you don't, I'd recommend starting before a hard drive failure makes you sorry you didn't.Do not choose "Erase and Sync"--you'll erase your music before you move it.If the window doesn't appear, go to the File menu and choose "Transfer Purchases from i Pod."The i Tunes Store purchases on the i Pod will then move to the new i Tunes library.