I tried to go to Disk Utility through recovery and ran first aid but it only says “unable to unmount volume for repair” and “first aid process has failed”. I also looked up some solutions online and using force unmount on terminal still doesnt work:(Reinstalling Mac OS just brings me back to where I started. Question: Q: First aid could not unmount the volume for repair More Less Apple Footer This site contains user submitted content, comments and opinions and is for informational purposes only. Sep 22, 2016 Unmount the EFI partition! Also unmount WINDOWS partition if you can see it from Mac! Run the Install macOS Sierra from Apps. Restart your PC. Press space while hovering over Install macOS Sierra from Mac HDD, or something similar. Use ONLY 'without caches', at first. Give it a few minutes, install should start.
You can’t reformat a drive in macOS Disk Utility when the Erase button is grayed out. This might happen for a variety of reasons, all of which keep you from erasing or reformatting the drives connected to your Mac.
If your MacBook’s Disk Utility won’t let you erase drives, follow the steps below to fix it.
Contents
2 What if the Erase Button in Disk Utility is grayed Out?
3 Learn how to reinstall macOS after erasing your Drive
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How to erase or reformat a Drive using Disk Utility
Let’s start with a brief explanation of the correct way to reformat or erase drives using your Mac. Feel free to skip this section if you already know how to do it.
You may want to erase your drive as a quick way to create space for new files. Or you might need to reformat it so it works with different operating systems, like Windows, Linux, or even iPadOS.
When you reformat a drive, it also erases all the data on it. So make sure to back up any important files before erasing or reformatting your drives.
When you’re ready, here’s how to erase or reformat drives:
Open Disk Utility from the Utilities folder in your Applications.
In the sidebar, select the drive you want to erase or reformat.
Click the Erase button at the top of the window.
Choose a new name and format for your drive, then click Erase.
Wait for Disk Utility to erase or reformat your drive, then click Done.
What if the Erase Button in Disk Utility is grayed Out?
You’re probably reading this article because the Erase button was grayed out when you tried to erase or reformat a drive using Disk Utility. Use the steps below to fix it and let us know in the comments which one worked for you.
Step 1. Show All Devices and Erase the Parent Drive
By default, Disk Utility only shows the Volumes on your connected drives, rather than the drives themselves. A Volume is the partition or section of a drive you store data in.
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Open Disk Utility and select View > Show All Devices from the menu bar. You should see the device names for each of your drives appear in the sidebar.
Select the parent folder for the drive you want to reformat or erase, then click the Erase button again. Take note that when you erase a device, it erases all the Volumes contained within it as well.
Step 2. Run First Aid to Repair Your Drive Before Erasing It
Disk Utility has a First Aid feature that fixes all kinds of issues related to your drives: slow performance, corrupt files, or unexpected behavior. When you run First Aid, it scans the entire disk for errors and lets you know if there are any it can’t repair.
Open Disk Utility and select the drive you want to erase from the sidebar. At the top of the window, click the First Aid button, then agree to Run First Aid.
The length of time First Aid takes to run depends on the size of your drive, how much data is on it, and how many errors need fixing.
Combine this step with the previous one to run First Aid on the parent device for your drive, as well as the individual Volumes.
Step 3. Boot Into Recovery Mode to Erase Your Startup Disk
If you’re trying to reformat or erase the startup disk on your Mac, you need to boot into Recovery Mode first. The startup disk is the main hard drive on your computer: the one that stores macOS and all your data. It’s not usually possible to erase the startup disk because your Mac is using it to run macOS.
Recovery Mode is a special partition on your Mac you can use to restore from a backup, reinstall macOS, get online support, or erase your startup disk.
You should back up your Mac before trying to erase or reformat it.
When you’re ready to boot into Recovery Mode, restart your Mac and hold Cmd + R while it boots up. Keep holding both keys until you see an Apple logo or hear a startup sound.
You should see a macOS Utilities window appear. Select Disk Utility from this window and try erasing or reformatting your drive again.
Learn how to reinstall macOS after erasing your Drive
After erasing or reformatting the startup disk—if that was your goal—you need to reinstall macOS before you can use your Mac again. This is because the original macOS installation was on the startup disk you just erased.
Boot into Recovery Mode once more to reinstall macOS or follow our guide to factory reset any Mac. When you reinstall macOS, your Mac behaves as though it’s a brand new machine, with no data on it waiting for you to set it up.
He spent two years supervising repairs as a Genius Admin for Apple Retail and uses that knowledge to keep our troubleshooting guides up to date.
Long before that, Dan turned to Apple products from a musical background. Having owned iPods for years, he bought a MacBook to learn sound recording and production. It was using those skills that he gained a first-class Bachelor of Science in Sound Technology.
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I have an older 2012 iMac which is currently running 10.13.4 or at least I think it is. However, whenever I run Disk Utility I get the following. ____________________ Verifying file system. Volume could not be unmounted. Using live mode. Performing fsck_hfs -fn -l -x /dev/rdisk0s2 Performing live verification. Checking Journaled HFS Plus volume. Checking extents overflow file. Checking catalog file. Checking multi-linked files. Checking catalog hierarchy. Checking extended attributes file. Checking volume bitmap. Checking volume information. The volume Macintosh HD appears to be OK. File system check exit code is 0. Restoring the original state found as mounted. Operation successful. __________________ Should I be concerned that the volume could not be unmounted. What does that mean and what is the impact on my computer. I run Disk Utility regularly and this notice that the volume could not be unmounted seems recent. Any help of info would be greatly appreciated. TIA Paul