Reply Ian Small says: January 30, 2016 at 2:57 pm Brilliant! amsysdisk utliltytipstrainingunmount Russell HarrisRussell has been a member of the Amsys team for over 20 years, initially working within the repairs department, he is now a fully certified Apple Master trainer Disk Utility then successfully erased and reformatted the external drive!Many thanks for the clues that led me to this solution! Tried everything under disk utility, couldn't unmounted disk or said couldn't open disk, depending which disk. http://gsbook.org/unmount-disk/disk-macintosh-could-not-unmounted.php
But I have heard from readers that they are still seeing this disappearance as well. Up next How to force a Hard Drive to unmount for formatting in Mac OS X Disk Utility - Duration: 6:11. The only different thing I needed to do in terminal was to write the commands without the word "sudo". armineprox 343,373 views 4:33 How to reset your MacBook Pro to Factory Settings without Installation Discs - Duration: 3:28.
Reply Ben says: September 17, 2016 at 2:50 pm Is there a way to work around needing a password? Tried again with internal osx drive and still won't recognized 2nd drive. Couldn't unmount disk, then you may have to force an unmount through the terminal. Couldn't Unmount Disk Mac You should see some disks appear like /dev/disk0, /dev/disk1, /dev/disk2.
Using the above command can interrupt file read/writes, which can cause file corruption. Disk Utility Couldn't Unmount Disk External Hard Drive To comment on this article and other Macworld content, visit our Facebook page or our Twitter feed. We are now going to force erase the physical disk, creating a single Mac OS Extended (Journaled) volume. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/ Jul 10, 2013 8:43 AM Helpful (0) Reply options Link to this post by genemachine, genemachine Sep 11, 2013 9:52 AM in response to fineartist99 Level 1 (0 points) Sep 11,
Came across this and bingo, worked in seconds. Force Unmount Mac Reply Joel May 18, 2015 My Mac is single drive partitioned but I created another partition named "Mac HD2" to download Yosemite on it. If that doesn't work, I'd actually seriously consider booting Ubuntu or some other non–Mac OS X operating system to reformat the drive that way first, and then use Disk Utility to Reply Vishal February 5, 2016 Hi Tanya, Hopefully you are trying to refer USB boot drive.
Ask Mac 911 We’re always looking for problems to solve!
However, since you are erasing the drive anyway, this doesn't really matter in your situation. Can't Unmount Disk Mac Any OS X boot drive is needed to complete the task. At Least One Volume Could Not Be Unmounted I would also advise you to install Stellar Partition Manager on your Yosemite.
Regards Timothy Reply Vishal May 21, 2015 Hey Timothy, Thanks for writing to us. his comment is here Any help is greatly appreciated. –Ab'initio Jun 9 at 10:42 @Ab'initio This should be a separate question rather than a comment. It will ask you to create image of Macintosh HD. This will not work if the error was triggered by attempting to modify the boot disk through partitions or formatting, and you will need to use the method above instead. Error 69888 Couldn't Unmount Disk
Reply Vishal May 28, 2015 We recommend you try recovering your deleted files with a professional software and not with any free recovery apps. Partition Failed With The Error Couldn't Unmount Disk You will need any OS X boot drive to complete this task, I used a Mavericks boot installer drive for this purpose but others should work too, whether they are installation Could you also let me know the file format to which your external drive was formatted before this error?
To learn more about the Mac OS file system: Take Mac Support for PC and Support Essentials Disclaimer: While the author has taken care to provide our readers with accurate United States Copyright © Apple Inc. Reply Jak says: January 29, 2015 at 5:37 pm Much appreciation! Volume Erase Failed Couldn't Open Disk Thanks a lot Kelvin 30th August 2015 at 3:21 am · Reply I got same error:-69888.
Some of the following steps are destructive and will lose ALL data on your drive. Many thanks. Worked like a charm for me to reformat an external drive. 100x easier than the other ways I read to solve the unmount issue, like boot disks, etc. http://gsbook.org/unmount-disk/mac-repairing-disk-failed-with-error-could-not-unmount-disk.php iMac 27 inch , iMac 21 inch, Macbook 15 inch, Macbook 13 inch.
Free recovery apps aren't reliable and won't give you the desired recovery results. The error, which is thrown, is the: ‘Disc erase failed couldn’t unmount disc.' or ‘Disk Erase failed with the error: Couldn’t unmount disk.’ The error occurs in such situations like formatting I've never seen that. Then, further install the OS X on it 5.
I just want a fresh install, no need to have any data recovered –Chris May 5 '15 at 19:34 Warning...it is not the disk0, check again, it is probably Now, take an HDD and format it to OS X extended journal 3. Typically the "Couldn't Unmount Disk" error pops up when the currently boot drive is being modified, thus the easiest solution is to boot from another drive and run Disk Utility from Causes The reason for this error is the modification of the boot drive, or it is being used by some other process or application.
How to change the schema of stored procedure without recreating it How to respond to a ridiculous request from a senior colleague? Related: OS X Macs Storage MacOS Hints OS X El Capitan Shop Tech Products at Amazon You Might Like Notice to our Readers We're now using social media to take your Give it a shot: http://emsooriyabandara.blogspot.com/2014/11/solved-external-hard-drive-not-detected.html Reply Jaycie Turner says: December 11, 2015 at 12:06 pm Whenever I go to type the password, it has a round dot and won't let me With the help of bootable media you need to boot into Mac and resize Macintosh HDD so that it claims that unrecognized spaces.
I was able to force an unmount and could wipe the disk. Im just happy i didn't have any files on the computers, so nothing was lost, just my time it took to fix them. Published on Aug 11, 2015External Hard Drive, Usb drive, Flash drive, Yosemite OS X , El Capitan OS X, Macbook pro, iMac, macbook air, macbook, macbook retina display, macbook retina display Ignatius College Prep Tech Blog on Another opinionated guide to Munki manifestsAlan Siu on Absolute beginner's guide to setting up Munki (not monkey)Sam K on Absolute beginner's guide to setting up
Reply Owen August 12, 2015 I was installing windows 7 on my Mac through boot camp when Disk Utility showed me a pop-up which says “Unrecognized file system”. First, figure out your password. theComputerGuru 198,114 views 5:29 Disk utility repair disk error - Duration: 7:11. 121macfreak 76,199 views 7:11 HOW TO: Delete a partition on Mac - Duration: 1:29. Thank you so much.