Removing a second disk may cause problems if the root playlist is stored on the second disk. Before you remove the disk move the files 100, 101, 110 and 111 onto the first disk if they aren't already there. Once you've removed the disk resync with emplode.

You may find that some tracks end up in unattached items if the playlists containing them were on the second disk but the tracks were on the first disk.

It can be done with care :)

--
Mike Crowe
I may not be speaking on behalf of empeg above :-)