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Windows can't recognize USB device at start up

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I have two USB expansion drives. They have permanently been assigned drive letters (Y: and X: ) This is so they can be removed and then plugged back in to maintain the pathways for other files and programs.It was working fine and then one day not. At start up, Windows can only see an "unknown device" for drive X: and can't load the drivers. It's OK with Y: . I have deleted and reinstalled the...

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