This new version of SDC-DOS is great! I created a STARTUP.DSK that mounts on power on in drive 0, and SDCX.DSK mounts in drive 1. The AUTOEXEC.BAS program on STARTUP.DSK mounts my NitrOS9 volume in drive 0, maps drives 2 and 3 to two DriveWire disks, and then runs SDCX from drive 1. Thanks Darren!