There is a SCSI Option upgrade (the Roland VS4S-1) for the VS-840 series. It is user installable (in the VS-840EX and GX models) and can be purchased through the Roland Customer Service Department. It allows for an additional external Zip drive to be used with the VS-840 series for the purpose of copying song data more efficiently, but it does not make the VS-840 compatible with the Roland CD burner.