Select your disk in Disk Utility Choose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility. As far as I know, I didn't see that disk2 in my disk list before. #Cannot unmount disk mac mac os xIn Disk Utility, I found another disk called disk2 and Mac OS X Base System. But, when trying to partition, Disk Utility said that it cannot unmount the disk. On my laptop, the drive shows up in disk utility but not in Finder. From the utilities window in macOS Recovery, select Disk Utility and click Continue. So I tried to use Disk Utility to erase the startup disk and make a new partition. 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. 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. 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: 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: 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.
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