mac erase process has failed couldn t unmount disk

MAC ERASE PROCESS HAS FAILED COULDN T UNMOUNT DISK HOW TO

The problem will otherwise continue to be unresolved.

Note that you must use a boot system to perform this operation. Try to proceed to the next level if it continues. You should try to check the status of the error after you have completed all these measures.

In this way, you will be able to complete the repair process.

When done click on the “First Aid” option.

Basically, it is a Utility menu which is used for the Installer Disk Verification of the Disk.

Now, you have to access the Disk Utility, with the help of the Boot menu.

After that, you have to hold down the OPTION key, as well as, you have to select the boot drive which has been selected.

First of all, you have to attach the Boot drive into the Mac and you have to reboot your device.

However, the main thing to recall is that the installer or recovery drive needs to be on the drive and isolated from the primary boot drive, using the installed OS. This allows you to complete the task with an OS X boot drive. This is one of the most famous ways to solve this problem.

MAC ERASE PROCESS HAS FAILED COULDN T UNMOUNT DISK HOW TO

How to Fix Error: -69877: Couldn’t Open Device?Īlthough for many reasons you may encounter this error, you can repair it using the following simple hacks and tricks. Well, let’s begin the problem-solving process after we know the causes now. This can cause your Mac computer to experience this error. If the partition OS X Recovery exists then the device can’t alter or disassemble the internal drive. It may also occur if any other program or method uses the same unit. The key explanation for this error is the boot drive update. On Mac, you receive the Error: -69877: Couldn’t Open Device if you experience this error. Why Error: -69877: Couldn’t Open Device occurred? Solution 2: Fix it using Recovery Partition.How to Fix Error: -69877: Couldn’t Open Device?.Why Error: -69877: Couldn’t Open Device occurred?.

Mac erase process has failed couldn t unmount disk