ricciparker

I have a MZ-NH900 with Hi-MD capability. I have a large collection of minidiscs with music on that I'd like to copy to my PC. When I try to transfer SonicStage comes up with an error warning stating "Unable to transfer the following tracks to My Library because they are recorded by Net MD or another computer." Is this because this is not the computer the discs were made with or I need a different type of minidisc or some other reason. Many thanks for any help given.