Once you’ve created your boot drive you’ll need to reboot under it. And off you have the older models it will have limited RAM so that also comes to play. Mojave requires Metal2 graphics services which your system does not have. High Sierra intro’ed APFS which only works on SSD’s but using it within a SATA based system is not that great. I do recommend you stick with Sierra Vs any of the newer MacOS’s. 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. 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. 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. I tried to repair or erase “Apple HDD HTS547575A9E384 Media” but it does not work. 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. In Disk Utilty I see under Internal “Apple HDD HTS547575A9E384 Media” under which is greyed out my “Macintosh HD”. Now I can not even reformat the HD using Disk Utility from CMD+R mode. 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. I think the problem might be something with repartitioning the HD but I see others have problem with encryption as well. After that I went to encrypt my HD using FileVault and it got stuck for days at around 60%. I just cannot start it because the installation fails and something is still running, I guess.I am running Macbook Pro (Late 2011) on Sierra osX.įirst I repartitioned my HD into single partition(I had Bootcamp). I already have a boot image on my USB drive. I would like to clean install OS X lion again. Is that disk2 the reason why I cannot partition my main HD? How can I unmount or erase that disk2 Mac OS X Base system ? So I tried using Terminal to force unmount that disk, but still it doesn't let me. I tried to unmount it or erase that disk2, but it won't let me. As far as I know, I didn't see that disk2 in my disk list before. ![]() ![]() In Disk Utility, I found another disk called disk2 and Mac OS X Base System. But, when trying to partition, Disk Utility said that it cannot unmount the disk. So I tried to use Disk Utility to erase the startup disk and make a new partition. I tried to reinstall, but nothing came up. So, I tried to reboot again, but it said that the reinstallation failed and asked me to reinstall again. I don't have any Time Machine backups.Įverything went file, but in the middle of the installation, it got stuck, and later the installation failed without any reason. My Mac running Lion was being slow, so I was decided to reinstall OS X.
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