Apple has released Thunderbolt Firmware Update v1.1, which addresses a problem with the mid-2012 MacBook Pro (when using certain Thunderbolt cables) that prevented some bus-powered Thunderbolt devices from working as expected. The update requires Mac OS X Lion 10.7.4 or later. (Free, 442 KB)
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Move a File in the Finder
Sometimes you want to move a file in the Finder across volumes, not copy that file. Holding down the Command key while dragging ensures that the item is copied, and then its original deleted, adding up to a move.