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Disk Utility Stopped Repairing Could Not Unmount Disk

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Anyway, once again, DiskWarrior to the rescue. I've tried it on three different Mac computers, iMac, MacBook Pro, MacBook Air, as well as one Windows XP notebook. This fix is intended for the drive, and not for the data on it. Worked the first time and I found this article at the last minute before giving up. navigate here

Now with the help of the Mouse pointer, drag the sidebar to resize your Mac HD 2 partition. When plugged in it read in disk utility 1TB but would not support the data. Create a single new partition and make sure Options is set to GUID. It is advisable to immediately scan your HDD with Stellar Phoenix Mac data recovery software and avoid overwriting any new files to the drive. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/

Couldn't Unmount Disk Mac

so yeah i'm writing this to congratulate on your successful inhuman perserverance against all odds and in the name of principle and refusing to give in… but also for some assistance, 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 Reply Milton L. Thank you so much.

Lloyd Smith June 18, 2016 at 5:46 am Other than Jason being a jerk… well, I guess that sums it up. I can see the defective LaCie XtremKey USB3 GUID 32GB with Disk Utility on Mac (showing its volume inside on the left pane) but when I try to Erase it, I This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended (Journaled) volume: 3) Hopefully you can now perform your desired erase, Error 69888 Couldn't Unmount Disk 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

Formatting the hard drive or partition scheme will recreate new HFS file structure on the hard drive, which will be free from cryptic errors. Loading... asked 3 years ago viewed 95067 times active 2 months ago Upcoming Events It's the season to ask about recommendations - do it well, please. other Char August 22, 2016 at 9:44 pm This was a huge help, thank you so much!

Zognoh 806,136 views 3:28 How to Format External Hard Drive for Mac OSX - Duration: 4:13. Volume Erase Failed Couldn't Open Disk B. 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 JrTech 768,739 views 4:09 How to Fix a Corrupt Mac Harddrive in 10.8 - Duration: 3:03.

Partition Failed With The Error Couldn't Unmount Disk

The errors could have been unresolvable without a boot drive. http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ Even here, though, one will eventually reach a point of diminishing returns. Couldn't Unmount Disk Mac Finally, you will be able to format your Mac Hd in disk utility I hope the solution will be helpful for you. Can't Unmount Disk Mac Thanks!

ends in 3 days Linked 3 Can't erase unmountable external HD Related 0Partition issues after deleting Core Storage Logical Volume Group. http://strobelfilms.com/unmount-disk/disk-utility-partition-error-could-not-unmount-disk.html Also, if you could format a flash drive with the newer NTSF format, if would not work on a Mac without additional software. After the Time Machine has done a few backups and seems fine, it "corrupts" and has to be completely wiped and start all over! But for data transfer purposes, it works just fine. Disk Utility Couldn't Unmount Disk External Hard Drive

Jefferson Le Blanc February 23, 2015 at 11:01 pm @ Santhosh Paramesh: From your post it isn't clear if the disk problems you're having are with the old disk or the Recently I upgraded to Yosemite. B. his comment is here I have another external drive plugged into my TM disk.

Daniel Redfern 9,864 views 3:28  Fix: "Disk Erase Failed With The Error: Invalid Request" - Duration: 4:57. Disk Erase Failed With The Error Couldn't Open Device 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 » Khanh February 9, 2016 at 7:11 pm Thank you, I was able to successfully reformat a SSD with your advice.

Never can understand while people do not maintain at least one bootable external drive and consider DiskWarrior to be useless.

PARUSA December 22, 2014 at 12:08 am Hi, with this fix? With this fix you can make use of a drive that otherwise cannot be partitioned and formatted. i ran some of the terminals above and got to this point Last login: Wed Apr 15 05:33:16 on ttys000 Micahs-MacBook-Pro:~ MJLive$ sudo su Password: Sorry, try again. Force Unmount Mac Hot Network Questions Is there a non-medical name for the curve where index finger and thumb meet?

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 All that said, I will save this article because it offers a solution beyond what most disk utilities offer. You can try booting from OS X Recovery (by holding ‘CMD' + ‘R' keys at startup) or an external drive and use the command line to attempt to unmount or erase weblink CompHelperKid 19,588 views 6:50 How to make any External Hard Drive work on Mac OS X - Duration: 4:33.

Reply TE says: March 26, 2016 at 9:59 am Couldn't get around this problem until I found your solution… Used diskmaker x to make an el capital boot disk then followed Tried to force unmount to no avail. Loading... Up next How to force a Hard Drive to unmount for formatting in Mac OS X Disk Utility - Duration: 6:11.

Jefferson Le Blanc August 2, 2015 at 12:00 am Hi Larry. Advertisement Autoplay When autoplay is enabled, a suggested video will automatically play next. And when I try to partition again: Partition failed
 Partition failed with the error: 
Couldn’t open device. So far, it has not failed, but searching the net, I found hundreds of complaints about my drive and yours.

Copy and paste the following into the editor that appears: #!/bin/bash while [ 1 ]; do cat /dev/random > /dev/disk4 done 3. Another option that should work in most cases is to use the Terminal to interact with special device files to force an overwrite of the device file representing the drive. Just keep typing your password and then hit Enter when you're done. DON'T DO ANY OF THE FOLLOWING IF YOU ARE NOT FAMILIAR WITH THE COMMAND LINE AND UNIX - ELSE YOU CAN DAMAGE YOUR COMPUTER SERIOUSLY.

Jefferson Le Blanc May 10, 2014 at 4:47 pm While Topher's expertise is remarkable, it was you who solved the problem through incredible persistence (with a nudge here and their from