add folder to library problem
After importing the folder, I tried to play a track and "unable to locate file" appeared.
http://support.apple.com/kb/ht1751
Verify that you have consolidate option chosen. Think of itunes as shortcuts to your files. It is ot really the files themselves. When adding from drives the second you remove it the "shortcuts look for drive and cannot find it. /consolidate option actually copies to the computer itself.