if you dont copy music and *playlists* manually to O: all should be fine. install portable mb on O:, tick in mb prefs 'use relative paths' if want to attach drive O: to different pc sometimes (otherwise this option doesn't matter), import all music and playlists to mb (at this point they will located still on X:), check that all tags are correct, then re-organize you music in mb. your music will be *copied* from X: to O: and organized according to your organization template.