I'm trying this with two drives, the 120GB is a Hitachi, and the 80GB is a WD.
Strange: I had the 120GB in the cradle, and the 80GB connected in a USB enclosure. With both drives connected, 3.92 loads the 80GB. If I disconnect the 120GB and restart PMM, I get the error again. I did not try to copy any music. Anyway, that is an observation but not a solution.
Now I'm trying PMM 3.76. At first, there is no error message, but when it loads up the DMS I do not get the little eject icon in the explorer screen. It will copy music to the DMS but it will not copy anything to the playlists. When I try to eject, I get the drive ID error again.
I'm stumped. I'm really fed up with Music Manager, but at least it works. I guess I'm going back to it with my tail between my legs.