Seems your hard drive is corrupt and beyond the repair of Disk Utility. CellularProz 295,054 views 3:58 Mac OSX Lion How to do a Clean Install - Duration: 9:53. It will look like ‘diskx' where ‘x' is an integer starting at 0. Enter your admin password if prompted. check over here
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 Why so? The HDD has been acting up recently, very slow performance, bad behavior etc. However, this is not applicable for the modification of the boot disk with the help of partitions or formatting. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/
This feature is not available right now. Please let me know how should I proceed. Reply Nicola says: July 26, 2016 at 4:43 pm Thank you!! Any OS X boot drive is needed to complete the task.
The last command will prompt for password. Follow the steps mentioned in above reply (to Mabaker) in order to create boot dvd. At this point I'm not sure what else to try. Volume Erase Failed Couldn't Open Disk Hope this information helps.
Home Free Tools Toolkits Contact Us Offers Menu Home/Tips & Tricks/3 Ways to Fix ‘Couldn’t Unmount Disk' Error 3 Ways to Fix ‘Couldn’t Unmount Disk' Error Vishal Updated on July 27, Reply Ian Small says: January 30, 2016 at 2:57 pm Brilliant! Validate Random Die Tippers How to put a diacritic on top of an i? http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ Any help is greatly appreciated. –Ab'initio Jun 9 at 10:42 @Ab'initio This should be a separate question rather than a comment.
I advise you download & install Stellar Volume Repair tool and rebuild the drive corrupt directory structure. Disk Erase Failed With The Error Couldn't Open Device You must boot from another physical device. Now You Mac will Boot from the DVD. 5) Stellar Partition Manager is mounted on the DVD. Amsys will not compensate you in any way whatsoever if you ever happen to suffer a loss/inconvenience/damage because of/while making use of information in this blog.
Please download the demo version for a free evaluation. https://discussions.apple.com/thread/3894449?tstart=0 I love you so much Reply Leave a Reply Click here to cancel reply. Partition Failed Couldn't Unmount Disk Mac Using this bootable USB device we can boot (or start) a computer and perform data recovery or other tasks. Error 69888 Couldn't Unmount Disk This lists which process is run on the drive?.
There are three means of resolution of the problem. check my blog 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 David A. First, Download the OS X firmware from the official App Store 2. Couldn't Unmount Disk External Hard Drive
Sign in to report inappropriate content. We are now going to force erase the physical disk, creating a single Mac OS Extended (Journaled) volume. Sign in to add this to Watch Later Add to Loading playlists... this content This resolve my case.
acguevara 11,277 views 2:22 Mac OS X 10 11 El Capitan : Use First Aid Repair Errors - Duration: 2:57. Force Unmount Mac Reply Leave a Reply Cancel reply Your email address will not be published. King May 23, 2016 I am trying to restore my Mac OS X El Capitan from an external drive to my Mac HD.
Having struggled with Couldn't Unmount Disk for hours, I re-started my mac with cmd+r, opened terminal and unmounted disk. 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 After the download & installation of Yosemite I wanted to remove Macintosh HD partition but keep music and video files and transfer them to Mac HD2. Partition Failed Couldn't Unmount Disk External Hard Drive When you can come up with an exact, complete, consistent description of the problem, please post it.
You can resize the partition to take all the available free spaces on the Mac hard disk drive. Cox 356,526 views 5:16 Disk erase failed couldn't unmount disk - Duration: 0:44. If yes, then go to OS X utilities and format the entire hard disk drive. have a peek at these guys Daniel Redfern 9,864 views 3:28 Fix: "Disk Erase Failed With The Error: Invalid Request" - Duration: 4:57.
Spent hours searching. Purchased new HD and it initially recognized disk when formatting. 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 Enter the following where ‘x' is your disk identifier. (Remember to use the ‘diskutil list' command if you need to find out your disk identifiers): sudo diskutil unmount force /dev/diskx 2)