Here's the setup. CMS SCSI card to Miniscribe 20mb hard drive (old Mac SE drive). GS/OS 6.0.1 diskettes used to setup the hard drive. All files copied to hard drive with no errors; files are visible and runable from GS/OS. Turning off the machine and turning it back on produces a "Check startup device" error. Booting with the "no harddrive" GS/OS diskette works fine. All required files are on the hard drive.