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Following this, attempt to Erase/Partition the drive again in Disk Utility. Jefferson Le Blanc June 17, 2016 at 1:30 pm @ Jason Watkins: It's not clear which post you are referring to, the one just before yours regarding using a Windows PC This will ensure more of the drive is overwritten by the command, and possibly allow you to recover it. Sign in to make your opinion count. http://jessriegel.com/unmount-disk/format-flash-drive-on-mac-could-not-unmount-disk.html

Now, take an HDD and format it to OS X extended journal 3. Worked for me this morning. Even after I tried your final option, I got this message: Error: -69888: Couldn't unmount disk I've already recovered my files from the computer—all I want to do is wipe it Combining this with ^ ... http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/

Can't Unmount Disk Mac

Is every parallelogram a rectangle ?? If this happens, the drive may show up in the Finder sidebar but not show data when clicked, or it may just not show up but be present in Disk Utility; Here you can check out the KB article for the same. Plug-and-play.

A couple of weeks ago, I ordered a USB 3 Western Digital My Passport for Mac 3 TB drive for Time Machine. You should also see the name of the disk such as ‘Macintosh HD'. heavyshark December 16, 2015 at 3:40 pm Trying it again as fast as I can? Disk Utility Couldn't Unmount Disk External Hard Drive Disk Utility then successfully erased and reformatted the external drive!Many thanks for the clues that led me to this solution!

I have restarted many times to no avail. B. Jason M. http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ The flash utils you can find at http://flashboot.ru/iflash/ MaX April 14, 2014 at 4:02 pm Awesome!

Reply Leave a Reply Cancel reply Your email address will not be published. Volume Erase Failed Couldn't Open Disk Open disc utility find my external drive , that will not un mount or partition. Try then to erase, Mac OS Extended (Journaled) format, with Fastest Security Optiion, I get "Disk Erase Failed with the error: Unable to write to the last block of the device". I watched the video posted here that says to partition it, but my partition button is greyed out, what can I try next?

Couldn't Unmount Disk Mac

I really can't afford to pay someone $300 when I'm this close! https://discussions.apple.com/thread/4117187?tstart=0 May I suggest you write it up yourself and then ask Topher to publish it on MacIssues, if not on the main page, then on the forums as a stand-alone topic. Can't Unmount Disk Mac I have stupidity emptied my Trash. Partition Failed With The Error Couldn't Unmount Disk cheers and thanks for your time and consideration Andrei June 1, 2014 at 8:13 am Hi, I have tried to shrink my external drive in disk utility and the power shut

HELP!0Disk Utility Weirdness: Macintosh HD Cannot Be Repaired But Then Has No Problems?0Hard disk doesn't show on boot after erasing with Disk Utility1OS X can't unmount disk0Messed up 1TB Fusion Drive http://jessriegel.com/unmount-disk/mac-repairing-disk-failed-with-error-could-not-unmount-disk.html I now have a useable disk where before it would not mount and could not be formatted or erased. This resolve my case. But the blinking white light is so bright I have placed a strip of tape over it. Error 69888 Couldn't Unmount Disk

Thanks for your answer Topher. But all that environmental durability is wasted if the drive itself tends to fail. And three, that it appears to contain an OS X base system, which is usually just an invisible boot partition or in some cases can refer to an OS X recovery http://jessriegel.com/unmount-disk/format-external-hard-drive-mac-error-could-not-unmount-disk.html The fist step has worked perfectly.

Reply Nicola says: July 26, 2016 at 4:43 pm Thank you!! Disk Erase Failed With The Error Couldn't Open Device Why wouldn't the part of the Earth facing the Sun a half year before be facing away from it now at noon? Thank you again!

Providing links can also help the OP, and others, find additional info for themselves.

We'll cover both with a bit of explanation. You're just slinging mud, which is less than helpful. Advertisement Autoplay When autoplay is enabled, a suggested video will automatically play next. Force Unmount Mac 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

Topher Kessler Post authorSeptember 6, 2014 at 11:52 am You are very welcome! Clang August 25, 2015 at 12:36 am Hot damn! 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 this contact form With any of the Security zero overwrite functions, the result is "Secure Disk Erase failed with the error: Securely erasing data to prevent recovery failed".

from there i booted the iMac on its original OS X lion and from there downloaded the public beta of mac os sierra, which i was supposed to in the first Same result there. thanks in advance patriksundback May 18, 2015 at 1:44 pm Brilliant solution! If you can access the drive on Windows, go ahead and format it Fat 32.

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, CompHelperKid 19,588 views 6:50 How to make any External Hard Drive work on Mac OS X - Duration: 4:33. NOTE: Use of the ‘sudo' command may not be necessary for some of these actions, however, as long as you know the administrator account's password, starting any unix command with ‘sudo' The solution lies only in using a separate USB drive for fixing the error.

Lloyd Smith June 18, 2016 at 4:58 pm Ooops! Lloyd March 6, 2015 at 1:44 am I also use a 1 TB hybrid drive from Seagate in a MacMini, two LaCie external enclosures and a Pro Book. Retox Media 16,568 views 2:29 How to Format An External Hard Drive for Mac - Duration: 5:16. Topher Kessler Post authorApril 7, 2014 at 7:01 pm This command should overwrite the partition table, but if the drive is working then the system should be able to recognize it

You might erase this disk but this will lead to loss of data and erase process may end up unexpectedly. Worked swell! Before doing what you explained in the article, Disk Utility showed a single volume (partition) inside the drive. Ask Different works best with JavaScript enabled MacIssues How to use, troubleshoot, and repair your Mac Menu Skip to content Main Troubleshooting Hardware How-To Core OS X Printing and Peripherals Sharing

will it delete the files on the disk? Both were WD.