by GS/OS and mounted on the Finder display?
The problem you mention is fairly common. GS/OS via its FSTs has pretty strict definitions for what qualifies as a valid DOS or ProDOS diskette. For example, perfectly good 36-track DOS 3.3 diskettes will not be mounted by the Finder just because the number of tracks is 36 instead of the expected 35. Naturally, copy-protected diskettes have practically no chance of being recognized. Almost certainly, this is the reason the Finder will not mount your MECC disks. You can, still, run software from most copy-protected diskettes by just booting them.
