After making sure you have a backup
add to library from the new drive. Bear in mind it will reset various tags such as date added/modified/play counts etc but the data should be otherwise fine. If you don't trust me, you wouldn't be alone, but try it with just a couple of songs first.

I have had to do this when I added a NAS drive and foolishly ignored the step by step instructions for moving a library.

Alternatively move the location of itunes media folder in preferences to the correct/preferred location delete the copy on your storage and if the add to folder box is ticked it will move them automatically when you do the above. Six of one half dozen of the other.
( number5 has been fighting tramps and losing., Thu 1 Mar 2012, 14:29, Reply)