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[Scatty]

If your Master of Magic CD is burned, as you say, and not the original one, it might miss some files, that all have to be on the CD, upon which the game doesn't find the original CD.
But in case you still have the full original (just burned) CD, don't mount the folder of the game but the C: drive instead like you already did before. Like this:

mount c c:/ (if you don't want the advise at the start of DosBox, use / instead of \)
mount d d:\ -t cdrom -label DISCNAME (replace DISCNAME with the name of the CD, and don't use / here, only \, otherwise only limited CD-Rom support which causes the game to be not able to find the CD)
c:
cd games\m_magic (assuming you installed the game into folder with such name)

Hope that helps in running the game