Added ability to write protect Mass Storage disk write operations from the host OS.

Demos/Device/ClassDriver/MassStorage/MassStorage.h

@@ -73,6 +73,9 @@
 
 		/** Blocks in each LUN, calculated from the total capacity divided by the total number of Logical Units in the device. */
 		#define LUN_MEDIA_BLOCKS         (VIRTUAL_MEMORY_BLOCKS / TOTAL_LUNS)
+		
+		/** Indicates if the disk is write protected or not. */
+		#define DISK_READ_ONLY            false
 
 	/* Function Prototypes: */
 		void SetupHardware(void);