I decided to reformat my HD to make a clean install(I have backed up the system with Time machine) after Disk Utility have failed to repair the disk. Now I can not even reformat the HD using Disk Utility from CMD+R mode. In Disk Utilty I see under Internal “Apple HDD HTS547575A9E384 Media” under which is greyed out my “Macintosh HD”. on Disk Images I see “Apple disk Image Media” which is 2.01 GB and has under it “OS X Base System”(1.29 GB) with option to eject which does not work. I tried to repair or erase “Apple HDD HTS547575A9E384 Media” but it does not work. When erasing it says “Erase process has failed” with details saying “Couldn’t unmount disk - Operation failed”.Įither make the encryption in FileVault to continue the progress which didn’t work after reading about it and trying things… or to erase the HD and start a new install from my Time Machine backup. ERASE PROCESS HAS FAILED MAC COULDN T UNMOUNT DISK INSTALL Think of it this way your shoes heel broke off and your stop by a shoe cobbler how is he going to fix your shoe? You need to take it off right! Thats the same here if you want to reformat the drive you need to boot up under a different drive to release the drive from the OS. Here’s how to do this: How to create a bootable macOS Sierra installer drive So you’ll need to make an external bootable drive and besides that you’ll want to put on it the OS installer so you can appear a fresh copy from it. ERASE PROCESS HAS FAILED MAC COULDN T UNMOUNT DISK HOW TO I do recommend you stick with Sierra Vs any of the newer MacOS’s. High Sierra intro’ed APFS which only works on SSD’s but using it within a SATA based system is not that great. Mojave requires Metal2 graphics services which your system does not have. And off you have the older models it will have limited RAM so that also comes to play. Once you’ve created your boot drive you’ll need to reboot under it. In the menu you’ll find access to Disk Utility to prep your drive and then re-install your OS. Part 1: Why the Erase Process Fails on Mac?.Part 2: Common Fixes to Solve "Erase Process Has Failed" on Mac.Part 3: A Complete Process to Erase Hard Drive on Mac.Part 4: Tips for Erasing a Disk Without Losing Data.Part 1: Why the Erase Process Fails on Mac? To learn different ways to fix the Mac Disk Utility erase process has failed error, it is important to diagnose it first. The following are some of the major reasons for the error to help you understand its causes. The hard disk on your Mac might be corrupt or unavailable.The presence of malware or virus on your Mac can also cause this problem.If you are trying to format an external device and have removed it while formatting. You could be trying to format a volume in Mac HD that might not be logically present.Any other security-related issue could have stopped the process in between.Your system might be ruining an old or outdated macOS version.The essential Mac components related to Disk Utility might not be initiated properly.ERASE PROCESS HAS FAILED MAC COULDN T UNMOUNT DISK PRO.ERASE PROCESS HAS FAILED MAC COULDN T UNMOUNT DISK INSTALL.ERASE PROCESS HAS FAILED MAC COULDN T UNMOUNT DISK HOW TO.
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