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Could Not Unmount Disk Error Mac

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I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go. $ diskutil list disk2 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: Reply Monish d kothari says: September 13, 2015 at 6:17 am For people unable to boot from other disk ( elaborated method) : * Download the OS X firmware form App Running OS X 10.9.5. share|improve this answer answered Dec 9 '15 at 6:44 Dannid 20624 Well the disk hasn't worked until today. have a peek here

Hope this information helps. Ignatius College Prep Tech Blog Proudly powered by WordPress current community blog chat Ask Different Ask Different Meta your communities Sign up or log in to customize your list. Reply Eugene May 19, 2015 Why the software is not showing my Boot Camp partition? Please let me know how should I proceed. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/

Disk Utility Couldn't Unmount Disk External Hard Drive

Press Ctrl+C to abort execution of the last command in a minute (it's enough to just fill the beginning of the disk with random garbage). Loading... This can happen during partitioning, disk verification and repair, and even during formatting, and there's usually little to no additional information provided as to how to resolve the problem or even Looks like it starts erasing, but then quits and says at least one volume could not be unmounted.

WhyNotVideo211 46,082 views 4:57 How to restore MacBook pro - Duration: 6:06. It is a Seagate 1TB drive. Sep 23, 2011 2:07 PM Helpful (0) Reply options Link to this post by Kappy, Kappy Sep 23, 2011 2:13 PM in response to hoosier Level 10 (274,127 points) Desktops Sep Error 69888 Couldn't Unmount Disk Reboot the Mac holding down the "Option" key and choose the Recovery partition Select "Disk Utility" from the boot menu Go to "First Aid" to verify and repair the disk, or

Hot Network Questions Does Wand of the War Mage apply to spells cast from other magic items? Reply Alan Siu says: December 11, 2015 at 12:11 pm In the terminal, there's no visual feedback for passwords. For the older Mac OS X like 10.6 or earlier, the opportunity lies in a SuperDrive and a bootable DVD, and this can also offer the same resolution. (3) Fixing With https://discussions.apple.com/thread/3342839?start=15&tstart=0 Enter your admin password if prompted.

Reply Joel May 18, 2015 My Mac is single drive partitioned but I created another partition named "Mac HD2" to download Yosemite on it. Force Unmount Mac 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 why do they give the same output? Reply Alysia March 15, 2016 I'm trying to format a new external hard drive and it is not working.

Couldn't Unmount Disk Mac

I tried booting up off an external osx drive, and now it won't even recognize the disk. http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ Target mode gave me the same error that the disc could not be unmounted Sep 23, 2011 4:41 PM Helpful (0) Reply options Link to this post by dmdimon, dmdimon Sep Disk Utility Couldn't Unmount Disk External Hard Drive How can I make this resizing possible? Partition Failed With The Error 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.

Couldn't repair, said to reformat, but couldn't erase anything either. navigate here Skip navigation Sign inSearch Loading... Select the ‘First Aid' tab and verify the troublesome disk, repairing if needed. I would suggest copy and paste. Can't Unmount Disk Mac

Please reload CAPTCHA. − 2 = two Notify me of followup comments via e-mail. Reply Vishal August 13, 2015 Hi Owen, Yes Stellar Partition Manager V3.0 will address your issue. His OS X and iOS tips have been some of the most popular posts on the blog. http://strobelfilms.com/unmount-disk/disk-erase-failed-error-could-not-unmount-disk-lion.html See How to Answer on how to provide a quality answer. - From Review –fsb Sep 29 at 13:18 add a comment| Your Answer draft saved draft discarded Sign up

Search for: Search Recent Posts Another no-image workflow with Munki and Packages Script "Restrict changing networks to administrators only" on macOS Can't paste from Google Docs to Microsoft Word on Mac Disk Erase Failed With The Error Couldn't Open Device Any help is greatly appreciated. –Ab'initio Jun 9 at 10:42 @Ab'initio This should be a separate question rather than a comment. After searching for a very long time through forums of people suggesting basic things or trying to make others feel ignorant this solution worked!

This resolve my case.

Easy Steps 14,351 views 4:05 How to Erase or Partition a Drive in Mac OSX - Duration: 6:50. But I kept it, lets see what I can do :) –Peter S Dec 9 '15 at 7:37 Good luck, hope it works! –Dannid Dec 9 '15 at 8:00 Reply John says: August 10, 2016 at 1:13 am You can force unmount a drive by running the following Terminal command: diskutil unmountDisk force /Volumes/VOLUMENAME Replace VOLUMENAME with the name of Volume Erase Failed Couldn't Open Disk Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site.

Regards Vishal Reply Jacob May 26, 2015 Suggest me some free data recovery apps. Thank you so much. Reply Vishal February 5, 2016 Hi Tanya, Hopefully you are trying to refer USB boot drive. http://strobelfilms.com/unmount-disk/disk-utility-partition-error-could-not-unmount-disk.html Back up as many of your files as possible, reformat the disk, and restore your backed-up files.

In Terminal I tried: diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *251.0 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 140.0 GB disk0s2 3: Booted from a boot usb and it did the trick. Thank you very very much. After the installer loads select your language and click on the Continue button.

Sign in to make your opinion count. Name (required) Mail (will not be published) (required) Website « Grab the iOS 7 Default Wallpapers for iPhone & iPod touch Evolution of the iPhone & iOS Home Screen » Worked perfectly after many failed "solutions". Used diskmaker x to make an el capital boot disk then followed your steps and it worked on my 2013 MacBook Pro with Yosemite version.

Sign in Transcript Statistics 10,434 views 17 Like this video? About The Author Vishal Vishal is a Mac data recovery expert at Stellarinfo.Com. Sign in 1 Loading... So the first thing to do is to startup the Mac from another bootable drive such as an external drive or OS X Recovery.

I'm not a technology person? I ran Disk utility repair disk but it gave me back this message ‘Disk Utility can’t repair this disk. Browse other questions tagged macos hard-drive disk-utility partition or ask your own question. My Specs are MacBook Pro 2012 4GB 1TB.

Regards. The solution lies only in using a separate USB drive for fixing the error. This was driving me crazy. If yes, then go to OS X utilities and format the entire hard disk drive.

Graham 22nd June 2016 at 3:33 pm · Reply Thanks Man,, managed to force unmount a drive offline and run a repair 😀 Leave a reply Cancel reply Your email address