My settings for my cdrom drive only got these lines: Config.sys DEVICEHIGH /L:2 =C:\DOSDRV\DRV\VIDE-CDD.SYS /D:MSCD000 Autoexec.bat LH /L:2 C:\DOSDRV\DRV\MSCDEX /D:MSCD000 /M:15 /E /S /L:D /V this works with my old toshiba 2x or 4x cdrom drive. But seems like you are using a diffrent memory manager …