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External Hard drives are used to save, back up or transfer many important files because they have large capacity and stable performance. However, external hard drives can inevitably stop working in a sudden. Some common symptoms of a failing external hard drive on Mac: The hard drive does not show up on Mac, especially not in the Finder or in the Disk Utility. Files are missing or changing sizes.The hard drive keeps connecting and disconnecting from the computer.The error message “The disk you inserted was not readable by this computer” pops up when the hard drive is attached.The hard...