The solution lies only in using a separate USB drive for fixing the error. I need to get this one fixed and get the internal one running again, because i can't have two computers running off one external drive, and i still need to fix Further, the disk manager utility will allow the user to create, resize, add partitions on the hard drive with HFS, FAT or NTFS file systems. (2) Fixing with USB Boot Drive Reply uzz says: July 21, 2016 at 1:05 pm You don't need any boot drive nor recovery partition utility to fix this error. have a peek at these guys
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 Reply Alan Siu says: September 20, 2016 at 12:44 pm You really have to tackle one problem at a time. Directly below it, is the "Macintosh HD" option. Save the changes and restart Mac OS X.
I did Google your error, and came across this workaround. Press done to continue Reply Vishal October 19, 2016 Hi Sherri, Mac can't write to NTFS formatted hard drive but Stellar Partition Manager can help you format, resize, create, delete or Operation failed… Reply Alan Siu says: August 17, 2016 at 12:59 pm Based on the output you posted, your disk might have unmounted just fine. Nov 20, 2013 7:15 AM Helpful (0) Reply options Link to this post by Walter Moore, Walter Moore Nov 20, 2013 3:17 PM in response to Walter Moore Level 1 (0
The drive will not let me transfer files. http://technology.siprep.org/fix-for-disk-erase-failed-couldnt-unmount-disk/ Reply Bobby says: October 9, 2015 at 5:17 pm Excellent post! u_u Reply Alan Siu says: September 17, 2016 at 4:16 pm You may be able to rectify this issue by booting into single user mode, and then (after the fsck scan) Couldn't Unmount Disk External Hard Drive Worked perfectly after many failed "solutions".
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The last command will prompt for password.
Quit DU and return to the main menu.Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button.Note: You will need an active Internet connection. Error 69888 Couldn't Unmount Disk It may take a long, long time. These are: (1) Fixing with Partition Manager If the OS X is denying you to format, erase and repair the Mac hard drive or a volume due to the Couldn’t Unmount Disk’ COMMUNITY RULES Writing a Quality Post Reply With Quote 01-05-2015,11:57 AM #7 howardhonig View Profile View Forum Posts Member Since Nov 03, 2012 Posts 6 I plan on replacing the drive.
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/disk-utility-erase-error-could-not-unmount-disk.php share|improve this answer answered Jun 13 '14 at 6:24 Graham 11 Transmac worked for me also. I have stupidity emptied my Trash. Reply Jimmy Kiddo says: August 13, 2016 at 10:05 am Man, you are a genius,,,worked like a charm Reply Brock says: September 15, 2016 at 7:54 am This worked for me Can't Unmount Disk Mac
Geekanoids 166.323 görüntüleme 9:53 How To Format a USB drive on Mac - Süre: 5:29. I want to erase both partitions and make one. Reply Vishal August 13, 2015 Hi Owen, Yes Stellar Partition Manager V3.0 will address your issue. check my blog Reply abdul rahaman says: February 23, 2015 at 12:04 pm I want to install couldn't Reply Gary Bridger says: June 1, 2015 at 3:25 pm Ok I guess I done this
Could you also let me know the file format to which your external drive was formatted before this error? At Least One Volume Could Not Be Unmounted Reply Vishal May 13, 2015 To resize the Mac startup disk, you need to create bootable DVD. 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
Thanks. Reply Vishal November 11, 2016 If you are unable to boot your system from the other disk, please go through the below solution: 1. It is a Seagate 1TB drive. Couldn't Unmount Disk Operation Failed Open disc utility find my external drive , that will not un mount or partition.
Skip to content St. However, how could we be iin contact? I wouldn't have installed it on an everyday use (production) machine, but I guess what's done is done. http://gsbook.org/unmount-disk/os-x-volume-erase-failed-could-not-unmount-disk.php Sep 29, 2014 10:50 PM Helpful (0) Reply options Link to this post by mczink, mczink Dec 27, 2015 10:18 PM in response to kirikiri Level 1 (0 points) Dec 27,
I used the command and got this:Usage: diskutil u[n]mountDisk ... Enjoy this tip? WhyNotVideo211 46.082 görüntüleme 4:57 How to ║ Restore Reset a Macbook A1278 to Factory Settings ║ Mac OS X - Süre: 3:58. 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?
Why does remote Bash source .bash_profile instead of .bashrc Did Donald Trump say that "global warming was a hoax invented by the Chinese"? Booted from a boot usb and it did the trick. Restart your computer and when you hear the Mac "chime" immediatey click on the "option" key. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button and set the Zero Data option to one-pass.
Regards Timothy Reply Vishal May 21, 2015 Hey Timothy, Thanks for writing to us. I've tried to unmount through disk utility as well as through Terminal. This should unmount the drive so you can now do this:Install or Reinstall Mavericks, Lion/Mountain Lion from ScratchBe sure you backup your files to an external drive or second internal drive Why so?