For this example, let's say it's /dev/disk2. Reply Vishal May 18, 2015 Hi Joel, I am going to help you resolve your issue. I was able to force an unmount and could wipe the disk. However, this is not applicable for the modification of the boot disk with the help of partitions or formatting. http://gsbook.org/unmount-disk/disk-utility-erase-error-could-not-unmount-disk.php
Regards Vishal Reply Jacob May 26, 2015 Suggest me some free data recovery apps. I love you so much Reply Leave a Reply Click here to cancel reply. Using the above command can interrupt file read/writes, which can cause file corruption. Ignatius College Prep Tech Blog - trademarkable on How to read from and write to .plist files using PythonAlan Siu on Fix for disk erase failed couldn't unmount diskPages About this page
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) Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Follow the steps mentioned in above reply (to Mabaker) in order to create boot dvd. Enter your admin password if prompted.
Loading... This should force unmount the entire physical disk and all its related volumes: 3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk' error. (For example to Erase/Partition the 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 Error 69888 Couldn't Unmount Disk Reply Monish d kothari says: September 13, 2015 at 6:13 am Thanks a tonne for the help… It resolved my issues ….
It will look like ‘diskx' where ‘x' is an integer starting at 0. Volume Erase Failed Couldn't Unmount Disk 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' Reply Ava says: July 8, 2016 at 8:13 am I was trying to install tacos sierra on my 2011 iMac 21.5″ and it crashed my computer, and it just kept restarting. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/ Easy Steps 14,351 views 4:05 How to reset your MacBook Pro to Factory Settings without Installation Discs - Duration: 3:28.
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 Volume Erase Failed Couldn't Open Disk Formatting the hard drive or partition scheme will recreate new HFS file structure on the hard drive, which will be free from cryptic errors. Reply Audrey Hain November 10, 2016 Hi, I am a MacBook Pro user, and I am unable to boot my Mac system from other disk. Regards Timothy Reply Vishal May 21, 2015 Hey Timothy, Thanks for writing to us.
Otherwise, click on the Partition tab in the DU main window.3.
All Rights Reserved. Disk Utility Couldn't Unmount Disk External Hard Drive Sign in 264 Loading... Partition Failed With The Error Couldn't Unmount Disk Reply Dina B.
Advertisement Autoplay When autoplay is enabled, a suggested video will automatically play next. Check This Out http://www.stellarinfo.com/blog/repair-mac-hfs-hard-drive/ Hope this helps. I have stupidity emptied my Trash. Tech Tool Pro and Disk Utility don't seem to be able to fix the drive, so I decided to wipe the data by a reformat and writing zeros to the entire Can't Unmount Disk Mac
I would suggest copy and paste. You can use "sudo lost | grep dev/disk?" where "? First, Download the OS X firmware from the official App Store 2. Source 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
You should not physically unplug the drive. Disk Erase Failed With The Error Couldn't Open Device Cox 356,526 views 5:16 How To Format a USB drive on Mac - Duration: 5:29. Many thanks.
Worked immediately. Reply Adrie says: October 14, 2016 at 10:39 am Great answer. 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 At Least One Volume Could Not Be Unmounted However, since you are erasing the drive anyway, this doesn't really matter in your situation.
Junaid Rupani 878,158 views 6:06 How to ║ Restore Reset a Macbook A1278 to Factory Settings ║ Mac OS X - Duration: 3:58. This feature is not available right now. 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 http://gsbook.org/unmount-disk/mac-disk-utility-could-not-unmount-disk-error.php Stellar Partition Manager doesn't resize EXFAT partitions.
Sign in 1 Loading... We'll cover both with a bit of explanation. PLEASE HELP!! United States Copyright © Apple Inc.
The following steps can do the fixing: The USB boot drive is attached to the Mac, and the system is rebooted The OPTION key is held during the booting and then