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			Yes it is platform specific, just tested. 
 
At home, I'm running OS X Snow Leopard (10.6) and experience this bug. 
 
Just tested the same beta version of calibre on Windows 7 at work and the "eject this device" works as expected and unmounts both volumes.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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