It's a 3.5" hard disk, not 2.5" laptop drive.
The SSD's used aren't remarkable: https://discussions.apple.com/thread/3060690?start=0&tstart=0
	
		
			
		
		
	
				
			The SSD's used aren't remarkable: https://discussions.apple.com/thread/3060690?start=0&tstart=0