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Disk Erase Failed Could Not Unmount Disk Lion

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I tried booting up off an external osx drive, and now it won't even recognize the disk. Also make sure you use GUID in the partition options and NOT MBR Maybe the recovery partition is raising the error upon trying to erase the 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 Check this out: http://www.apple.com/macosx/recovery/ Feb 8, 2012 11:05 AM Helpful (0) Reply options Link to this post by mbahundra, mbahundra Feb 8, 2012 11:09 AM in response to Courcoul Level 1 http://strobelfilms.com/unmount-disk/disk-erase-failed-error-could-not-unmount-disk-lion.html

Thank you so much 🙂 Very clear instructions! You can read the following blog post on HFS drive corruption. It's the Macintosh HD indent that you should devote all your energies to. Reply Vishal May 13, 2015 To resize the Mac startup disk, you need to create bootable DVD. https://discussions.apple.com/thread/3721110?tstart=0

Volume Erase Failed Couldn't Unmount Disk

Disk Utility states the disk needs to be repaired, but when I try to repair the disk, "unable to unmount for repair" is stated. Stellar Phoenix Mac data recovery is free-to-preview software that allows preview of deleted, formatted and lost files in demo version. Privacy Policy Terms of Use Sales and Refunds Legal Site Map Contact Apple Skip navigation Sign inSearch Loading...

Have an external hard drive, which i used to boot up the iMac with el capitan, but i am still in the process of trying to erase the internal drive. Sign in to add this video to a playlist. About The Author Vishal Vishal is a Mac data recovery expert at Stellarinfo.Com. Can't Unmount Disk Mac The bootcamp assistant had failed halfway through the process, and it could not extend the partition to include the unallocated space ("partition failed").

I hope my explanation is useful to someone with the same problem. Partition Failed With The Error Couldn't Unmount Disk Disk Utility states the disk needs to be repaired, but when I try to repair the disk, "unable to unmount for repair" is stated. Jul 1, 2012 2:31 PM Helpful (0) Reply options Link to this post by Courcoul, Courcoul Jul 1, 2012 4:37 PM in response to shmengie Level 6 (14,550 points) iPhone Jul

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Please reload CAPTCHA. Couldn't Unmount Disk External Hard Drive share Share on Twitter Share on Facebook Email Link Like + Quote Reply viktorvos, Jan 5, 2013 viktorvos macrumors newbie Joined: Jan 5, 2013 #4 Can you please try to disable Thanks. Reply Vishal May 19, 2015 @Eugene.

Partition Failed With The Error Couldn't Unmount Disk

Would your software resolve this issue? It is advisable to immediately scan your HDD with Stellar Phoenix Mac data recovery software and avoid overwriting any new files to the drive. Volume Erase Failed Couldn't Unmount Disk It is a Seagate 1TB drive. Volume Erase Failed Couldn't Open Disk Formatting the HD will have recreated the new file structure on your hard drive and ‘Couldn't unmounts disk’ will also resolve.

Tried every single thing above. check over here I tried the other workaround; hdiutil detach, and i get an error saying "Resource busy" please advise Reply Alan Siu says: October 25, 2016 at 8:07 am This should help you CompHelperKid 19,588 views 6:50 How to make any External Hard Drive work on Mac OS X - Duration: 4:33. This is 100gb of drive space I am talking off. Disk Erase Failed With The Error Couldn't Open Device

Reply Alan Siu says: January 26, 2016 at 4:49 pm Try booting into recovery mode (holding down Cmd-R during bootup) and then erasing it from there. When you Mac boots with the DVD, you can select your Macintosh HD and press :DELETE: icon from the software menu. If you do this will all the folders at the root level it is clean and you can then use it for files. his comment is here I think the error "couldnt unmount disk" was due to the fact that somewhere in the process it said it was trying to "relocate the recovery partition".

Spent hours searching. Error 69888 Couldn't Unmount Disk Thank you in advance for any help on this matter. 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

Select Recovery HD from the Startup Manager." Feb 9, 2012 3:44 PM Helpful (0) Reply options Link to this post by mbahundra, mbahundra Feb 9, 2012 10:48 PM in response to

You may have to register before you can post: click the register link above to proceed. 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 Running Mountain Lion 10.8.3, 2011 27" iMac Apr 8, 2013 9:19 PM Helpful (0) Reply options Link to this post by Anas birrashed, Anas birrashed Jun 10, 2013 3:43 AM in Erase Process Has Failed. Press Done To Continue Subscribe London:020 8645 5803 Surrey: 0208 660 9999 Manchester: 0161 277 9600 © Amsys Ltd, Registered Office: 44 Poland Street, London, UK, W1F 7LZ Tel: 020 8660 9999 Email: [email protected] Company

Feb 9, 2012 11:41 PM Helpful (0) Reply options Link to this post by shmengie, shmengie Jul 1, 2012 2:31 PM in response to mbahundra Level 1 (0 points) Jul 1, This would let the errors be repaired, but still I would get the error "Disk Erase failed with the error: couldn't unmount disk" when I was trying to resize the partition You can create, delete, format and rename EXFAT drives however the software does supports resizing of HFS, FAT and NTFS formatted hard disk drives. weblink You should also see the name of the disk such as ‘Macintosh HD'.

This way you don't need to erase anything. Reply Jon says: April 18, 2016 at 9:55 am When I try to do this I get an errror on the terminal saying Sudo command unknown… Any ideas? ok. Internet, Networking, and Wireless iPhone, iPad, iPod iPhone Hardware and Accessories iPod Hardware and Accessories iPad Hardware and Accessories iOS and Apps Mac OS X Software OS X - Operating System

Once ejected I disconnected for a min, plugged back in and gave it another go. If you erase from there, you willlose the info on the SSD. You must be aware of USB which stands for Universal Serial Bus and it is used to support data transfer between two devices. so it doesnt let me go further...anybody understand this?

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 Reply Del Rey says: December 3, 2016 at 6:45 pm Worked for me reformatting a Seagate Backup plus to use with OS 10.6.8. Glassed Silver 214,416 views 2:57 How to reset your MacBook Pro to Factory Settings without Installation Discs - Duration: 3:28. Loves Crystal Palace FC Share this online Facebook Twitter LinkedIn Reddit Google++ E-Mail+ Responses (11) Crystal M. 5th August 2015 at 3:54 pm · Reply After installing an update, I couldn't

Some of the following steps are destructive and will lose ALL data on your drive. You can also subscribe without commenting. Powered by vBulletinCopyright ©2000 - 2016, Jelsoft Enterprises Ltd. I AM booting into Lion Recovery (cmd+r), but, I am unable to do any partition actions in Disk Utility.

Thanks Reply Vishal April 8, 2016 If Disk Utility is failing again & again to format the hard drive then you can try formatting with Stellar Partition Manager utility. Watch QueueQueueWatch QueueQueue Remove allDisconnect The next video is startingstop Loading... You can resize the partition to take all the available free spaces on the Mac hard disk drive. The problem you can't do wipe or partition on the disk is that the disk is in use, that's why I said before to do the Spotlight Privacy thing.

But, you can also do the following, you want to use the disk for files, why not just move everything to the trash, or better use terminal to remove all files Author Alan SiuPosted on April 13, 2015Tags disk utility, diskutil, erase drive, mac, unmount 40 thoughts on “Fix for disk erase failed couldn't unmount disk” Randall says: July 14, 2015 at Disk Utility gives you options to secure delete the partitions and hard drives. This prevents Spotlight from indexing your internal disk, I have seen this before.