![]() ![]() In the menu you’ll find access to Disk Utility to prep your drive and then re-install your OS. 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. Now, you have to select a disk in order to do force unmount. Undoubtedly, disk utility on Mac can be relied on for any logical issue in Mac hard drives. I do recommend you stick with Sierra Vs any of the newer MacOS’s. Step 2: Now, type the following command, this will make you appear a list of the disk which are available on your Mac: diskutil list. 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. You can also try following this article to format it if you have a Windows computer. Try formatting that to format the entire drive. In the side bar in Disk Utility you should now see something like '2TB Seagate Drive' or something like that. 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. Try going to Disk Utility then press View in the menu bar and 'Show All Devices'. 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. To do this, boot your Mac holding down the Command and R keys simultanously. 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. If no external boot drives are available then you can also try Internet recovery which basically loads the recovery partition from Apple's server (slow process). 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. As a first line step be sure to close all open files and programs. 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. Couldnt unmount disk errors usually appear in Disk Utility when the boot drive is busy. Disk Erase Failed Couldnt Unmount DiskExternal Hard Drive, Usb drive, Flash drive, Yosemite OS X, El Capitan OS X, Macbook pro, iMac, macbook air. I have lost my original Mountain Lion install discs. 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%. Total Size: 64.I am running Macbook Pro (Late 2011) on Sierra osX.įirst I repartitioned my HD into single partition(I had Bootcamp). Volume Name: Not applicable (no file system) fdisk doesn't do anything.Īny ideas how to fix a disk that is this severely screwed? -bash-3.2# diskutil listġ: Apple_Boot Recovery HD 650.0 MB disk1s1Ģ: Apple_HFS Mac OS X Base System 1.3 GB disk2s2ĭevice / Media Name: Corsair Performance3 SSD Media Attach the USB boot drive to your Mac and restart it. This should unmount all volumes of the physical drive: 4) Attempt again to perform whichever task caused your Couldnt Unmount Disk error. When I attempt to run fdisk to correct the MBR. I get an "error 6988 couldn't unmount disk". In this simplest case, if you have a disk that doesnt have any partitions, you can mount it directly using the wsl -mount command. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there but I can never erase or partition it. ![]() I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. ![]()
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