I have found myself recently experiencing a couple of Macs which would not allow me to repair the directory or permissions in Disk Utility, or erase/partition the drive with an error such as: ‘Disc erase failed couldn’t unmount disc’ or “Disk Erase failed with the error: Couldn’t unmount disk.” why? This error can happen during partitioning, disk verification and repair, and even during formatting, and there’s usually little to no additional information provided as to how to resolve it, this is really frustrating.
However, it still can fail to fix disk issues accompanied with some error messages, such as “Couldn’t Unmount Disk” error. This error generally results from improper modification of the boot drive, such as partitioning, disk verification or repairing or formatting. When this error pops up, not only will the Disk Utility halt suddenly, but also the disk will suffer as well, such as damaged data on this disk. Therefore, it is imperative to resolve this error as soon as possible. Here we will share you 3 solutions.
If you found your drive in unmounted condition on Mac and urgently need to recover the data then recover them as below steps.
Methods to fix “couldn’t unmount disk”
1. Resolve with USB Boot Drive
If this error occurs on the disk which is the boot drive, the simplest solution is to boot the Mac system from another drive and then run Disk Utility on the disk. By this means, you can make use of USB boot drive.
1. First off, insert the USB boot drive to Mac and reboot.
2. Then, during booting, you should hold down the “Option” key button to select the attached boot drive.
3. Next, in the boot menu, select “Disk Utility”.
4. After that, go to “First Aid” and verify the disk.
5. Lastly, just perform the original task on the original disk.
About other methods to fix “couldn’t unmount disk”,you can read: How to Fix "Couldn't Unmount Disk" Error.
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