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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.
Sep 21, 2017 First off, insert the USB boot drive to Mac and reboot. Then, during booting, you should hold down the “Option” key button to select the attached boot drive. Next, in the boot menu, select “Disk Utility”. Wavelab 5 windows 7 fix problem. After that, go to “First Aid” and verify the disk. Lastly, just perform the original task on the original disk. I've successfully installed the High Sierra GM candidate on my MacBook Pro. Joel osteen i declare pdf free download. I've spent the past few hours trying to get it to install onto my Mac Mini (Late 2014). Currently running Sierra. When I run the installer, it reboots, starts to install, then says 'Unable to unmount volume for repair'.
If your MacBook’s Disk Utility won’t let you erase drives, follow the steps below to fix it.
- Oct 18, 2019 'First Aid process has failed. If possible back up the data on this volume. Click Done to continue.' 'First Aid could not unmount the volume for repair. Click Done to continue.' 'First Aid found corruption that needs to be repaired. To repair the startup volume, run First Aid from Recovery. Click Done to continue.'
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- Couldn’t repair, said to reformat, but couldn’t erase anything either. Tried every single thing above. Looks like it starts erasing, but then quits and says at least one volume could not be unmounted. Tried to force unmount to no avail. Any idea what else I can do? I really can’t afford to pay someone $300 when I’m this close!
Mac First Aid Unable To Unmount Volume For Repair Iphone
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. The disk image joemac.sparsebundle is in use..
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.
![Mac Mac](https://i.ytimg.com/vi/pvo54n4jRp4/hqdefault.jpg)
Step 1. Show All Devices and Erase the Parent Drive
Mac First Aid Unable To Unmount Volume For Repair Cost
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.
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.
Dan is a freelance writer based in South West England. Cutting board designer keygen download. Como hackear dream league soccer.
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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Disk Utility User Guide
Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.
If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.
Mac First Aid Unable To Unmount Volume For Repair Service
- In the Disk Utility app on your Mac, choose View > Show All Devices.Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).
- In the sidebar, select a disk or volume, then click the First Aid button .If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
- Click Run, then click Continue.If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.
- If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
- If you can replace a file or re-create it, delete it.
- If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
- If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
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If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.
If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.
Mac First Aid Unable To Unmount Volume For Repair 69673
See alsoErase and reformat a storage device in Disk Utility on MacAdd, delete, or erase APFS volumes in Disk Utility on MacPartition a physical disk in Disk Utility on Mac