So that's why those "empty folders" in iTune couldn't be deleted

I spent quite some time trying to delete the seemingly empty folder within iTune music folder, but had no luck. I tried scripts, and even commercial application like Spring Cleaning, but still couldn't figure out why those folders didn't get deleted.

Finally I booted the system in Windows 7, and I instantly found out why. There were still some thumbnails in those folders, and that's why they couldn't be deleted by all sort of programs.

So I used XYplorer to find out those folder that were less than 200K in size and deleted them. After then I switched back to Mac, and need to manually manage some folders that contained music which for some mysterious reason didn't get migrated to new folder tree structure.

After about 1 to 2 hours, I finally have a clean iTune music folder structure. I even copied it to the share Z drive so that Windows Media Center can access those songs.