Force unmount volume mac os x

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  2. MacOS Sierra & WD Elements "Couldn't Unmount Disk" Problem - adrian milne
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If it successfully unmounts the volumes, the volumes are unmounted and thus should not show up in Finder. Is there a way to restore the data prior to erasing using the steps above? And what are you trying to do? Get data off the volume before erasing it? Great piece of advice! Worked at first attempt, I was running out of hope after trying several solutions from other forums. Thanks for the post.

Yeah, unfortunately, no idea on that. Honestly, since that appears to be an external drive, I would shut down the computer and then just unplug the drive. I have tried all the methods listed in previous comments. I used to have a boot camp windows 7 that was deleted a year ago If that would effect it. I am not using any external drives. After trying for several hours, came across this solution and it worked perfectly, thanks much for posting this!

Either way, glad this worked. How do you know which one to choose to unmount? Type df -h and hit Enter to see free disk space but this will also show the mounted paths. Why are you trying to unmount Macintosh HD? Are you booting from an external drive?

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Boot into recovery mode hold down Cmd-R while rebooting and then you should be able to unmount and erase Macintosh HD. Hence this series if inquiries. If you really want to erase the entire disk, including the recovery partition, you must boot from an external drive. Anyway, it sounds like I should be good to go. Thanks for the help, I really appreciate it. Thank you so much!

MacOS Sierra & WD Elements "Couldn't Unmount Disk" Problem - adrian milne

It took me an hour to find your page and I am glad that I did. You have made my day! Wanted to format it but then it still says it needs an unmounted disk. Hi Ronald, I ran across your post and see you had the same issue im having now with no luck in finding a solution.

This was a year ago I realize but do you happen to remember how you fixed your SDcard?

How to Unmount a Drive from Command Line on Mac

HUGE help! Simple solution that worked perfectly, and all the other solutions I found were very complex and would have been time consuming. Hello, I have the same problem and I ran into you website. I was trying to erase an external hard drive, and got this error. Following your directions, the disk was unmounted successfully in terminal. At Disk Utility, I saw the partitions of the external hard drive being greyed out.

So I clicked at the hard drive and clicked Erase, but still got the same error.


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  • What causes this error?

After ejecting it and reconnecting the drive, it seemed that nothing has been erased. What would you suggest? Thank you, Alan! Be sure you backup your files to an external drive or second internal drive, the following procedure will remove everything from the hard drive! We are now going to force erase the physical disk, creating a single Mac OS Extended Journaled volume. This should then allow you to partition and work with the physical disk again. This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended Journaled volume:.

While the author has taken care to provide our readers with accurate information, please use your discretion before acting upon information based on the blog post. This feature has been tested using OS X v 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? Thank you. Even after I tried your final option, I got this message:. Went back to disk utilities, erased it this time it did not complain at all , re-installed OS. Very smooth. Thanks a lot.

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I got same error This lists which process is run on the drive?. Then use activity monitor to force the process to quite and then redo the partitioning.


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Solution Disk Erase Failed with error Couldn't unmount disk mac

To repair damaged system, you have to purchase the licensed version of Reimage malware removal tool. Continue to Page 2 Post a comment. Wie behebt man auf dem Mac den Fehler "Das Medium konnte nicht deaktiviert werden"? Connect with:. Ask now online. Miners and how to avoid them How to fix Invalid Signature Detected? How to import Chrome Bookmarks to Safari? How to restore your Mac from a Time Machine backup? Rss feed Follow us Like us. All Rights Reserved. Partial or full use of information without the express written permission is prohibited.