Logic Pro X, GarageBand for Mac (v10.0): Reindex to fix issues with Apple Loops
If you move loops from the Apple Loops folder to another hard disk, you might not be able to find Apple Loops or you might experience other issues. If this is the case you may need to reindex your Apple Loops user library.
To reindex the Apple Loops library, click Loops at the top of the Loop Browser. Then, choose Reindex All Loops from the pop-up menu.