![]() To begin with, you have to access the Terminal application. Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. ![]() Lastly, select "First Aid" to re-verify the disk or choose "Erase" to format the disk at your will. Next, access Disk Utility from the boot menu. ![]() Then, when booting, hold down the "Option" key to select Recovery Partition. At this point, you can try solving it with Recovery Partition. If the error message appears during "First Aid" or formatting a non-boot disk, the above means will not make effects surely. Lastly, perform the original task on the original disk. After that, go to "First Aid" and verify the disk. Next, in the boot menu, select "Disk Utility." 4. Then, during booting, you should hold down the "Option" key button to select the attached boot drive. First off, insert the USB boot drive to Mac and reboot. By this means, you can make use of USB boot drive. If "Couldn't Unmount Disk" or "erase process has failed" error occurs, the simplest solution is to boot the Mac system and run Disk Utility on the disk. Methods to fix "couldn't unmount disk" error Therefore, it is imperative to resolve this error as soon as possible. When this error pops up, not only will the Disk Utility halt suddenly, but the disk will suffer as well, such as damaged data on this disk. It still can fail to fix disk issues accompanied with some error messages, such as "couldn't Unmount Disk" or "erase process has failed." This error generally results from improper modification of the boot drive, such as partitioning, disk verification, or repairing or formatting. What's worse, there's no additional information provided to solve the issue. And an error "Disc couldn't unmount disk" or "erase process has failed." Why? This error can happen during partitioning, disk verification and repair, and even during formatting. Have you ever met " couldn't unmount disk" or " erase process has failed" error on your Mac? How to fix it without data loss? Recently, I have encountered some problems on my Mac, and it didn't allow me to repair the directory or permissions in Disk Utility. Summary:Want to recover lost or deleted data from your Windows XP system? Free download Windows XP Data Recovery Software to recover lost files. Free Windows XP Data Recovery Software for Hard Drive Recover.Summary: In this article, we would like to recommend a best solution of free SD card recovery mac which can be used to recover loss data on Mac operating system. Completely Free SD Card Recovery Mac Software Download.It is a professional and conveniently recovery tool. ![]() Summary:With the help of Bitwar Data Recovery, you can recover shift deleted files and falsely formatted drive.
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