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. 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: When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. 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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