How to check what is missing from iTunes library?

Today I moved my entire iTunes library onto my external hard drive as I needed to reinstall Windows. I had 622 artists at the time. I copied over the entire My Music folder to my external hard drive before formatting my hard drive to make sure I didn't miss any files.
When the process of installing Windows was complete, and I had transferred my library back onto the PC and into the new My Music folder, iTunes now said that I have 619 artists in my library. However, there are still 622 artist folders in the iTunes Media/Music folder.
Can anyone recommend ways to accurately check what is missing, and suggest why the number is now lower? I have artists in my library with East Asian artist tags that have Sort Artist tags with English characters, so checking the folders in iTunes Media/Music against the iTunes library wouldn't be very accurate, as the orders are different.

Hi xtanto,
one more idea: I think that you can obtain some specific type of principal from the user principal object, and that type would differ for SSO and custom DB login.
E.g. FacesContext.getCurrentInstance().getExternalContext().getUserPrincipal() returns a JAZNUserAdaptor instance under OC4J, which object contains this specific type of principal object somewhere in the getSubject().getPrincipals().iterator(). Then you can tell which login module is in use by checking if you have a DBUserPrincipal or a RealmPrincipal. (Note that these classes are just guesses.)
Regards,
Patrik

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