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usb harddisk

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    MacBook Pro unmount and remind USB HD

    Hi My MacBook Pro 2018 (I9 15") unmount my external USB harddisk but in mount it again within 30 sec. I get the error message when it's unmounts. I tried difference setup: thru my usb-c hub (satechi), direct into computer, another usb cable and last another harddisk ( WD Studio and LaCie...