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			It sounds as if the Opus is mounting the file system as "Read Only", which would be done if it detected errors in it. Do you have access to a Windows PC that you could use to reformat the disk again as FAT32? Perhaps the Mac isn't doing it quite as a Opus "expects" it to be.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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