Currently Being ModeratedJun 25, 2012 1:44 PM (in response to grannyph)
It helps to post in the correct forum. This forum is for asking questions about how to use the forums in ASC. There are specific forums for iTunes For Mac and iTunes For Windows. Which platform do you use?
iTunes: How to move [or copy] your music to a new computer [or another drive] - http://support.apple.com/kb/HT4527
Quick answer if you let iTunes manage your music: Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive. Start iTunes with the option (shift on Windows) key held down and guide it to the new location of the library.