disk erase failed could not unmount disk

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.

Once the disk is unmounted, click on the Erase. 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: We recommend you erase the volume but not the entire disk to avoid the Secure Disk Erase Failed - Couldnt Unmount Disk error. Under Disk Utility, right-click on the flash drive listed in the left hand panel and click on unmount disk. 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: Partition failed with the error: Couldnt unmount disk - MAC I bought a new hard drive and followed the - Buffalo Technology 1tb Ministation Stealth USB. 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.

Disk erase failed could not unmount disk