If Disk Utility still cannot access the drive, you could try other tools such as TechTool Pro, or dedicated repair utilities such as Drive Genius.
Open Disk Utility and see if it works again, to re-partition the drive into a single volume. Then leave them for a minute or longer before powering up the external drive, letting it run up to speed, and only then starting up your Mac. Once your Mac has shut down, power the external drive down, perhaps by switching it off. How can I restore it to normal function?Ī Shut your Mac down with the external drive still running if this fails because the disk cannot be unmounted, force shutdown by holding the power button.
Q In spite of being able to ‘see’ my 2 TB Seagate external drive in Disk Utility, its icon is greyed out, and I am unable to mount or eject it.
