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This is a hard drive circuit board for Seagate desktop hard drives, with main board markings 100342240 REV A and 100440065 REV B. It matches label numbers 100342239, 100440064 and is specially designed for ST91608220AS. Used to repair faulty PCB issues such as no power, not detected, or damaged board. Each PCB is fully tested for reliability. Note that the original ROM chip must be transferred for normal use.