Mz NH-600 is the discman i have. i have sonic stage version 2.0 but as ive said, installation terminates when it tries to uninstall the old version of sonic stage. and yes, i do have all programs closed when installing. I never have any problems using sonic stage with ordinary discs. I tried different modes of memory on the disc too but still it fucks up. gaps in songs, crashing while uploading and deleting songs. Yes i do set it to Hi-MD too.