Select Mount in the top center of Disk Utility. Choose the grayed external drive in the Disk Utility's sidebar. Click on the 'Show All Devices' in the Disk Utility's View menu to show external hard drive icon.
Now you will able to select the device, make sure you select the device and not the partition, right click and click on Erase:Īfter you click on Erase you will see a screen similar to the image below and you will able to use the device again. Find Disk Utility by clicking Go at the upper left of your desktop and go to Utilities, then open Disk Utility on your Mac computer.
If the device is not completely damaged the solution for this is to create a new partition map on the device, this is also possible using Disk Utility using the hidden option Show All devices: Starting with Vista you need to manually unmount the hard disk to successfully write to it, or in other words: make sure the disk you edit has no mounted file. He asked me if I know I way to recover the devices, so I tried reformat the partition using Disk Utility, but it shows this error:
On my laptop, the drive shows up in disk utility but not in Finder.
Cannot unmount disk mac pro#
Couple weeks ago my brother's MacBook Pro started with some problems and it was damaging external drives like USB and SD cards, the system was corrupting the partition map of these devices and wasn't possible re-format the partition. Level 1 (26 points) Q: Error 69888 couldnt unmount disk - external drive wont erase Hi My external backup drive stopped showing up in finder and made disk utility freeze on 'loading disks' on my desktop.
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