I tried this but it still didn't work, it says "unable to unmount 1 or more part" or something like that. Name (required) Mail (will not be published) (required) Website « Grab the iOS 7 Default Wallpapers for iPhone & iPod touch Evolution of the iPhone & iOS Home Screen » Went back to disk utilities, erased it (this time it did not complain at all), re-installed OS. Restart your Mac system and reply to configuration prompt. my review here
Reply Tanya February 4, 2016 What is a USN boot drive? Jefferson Le Blanc August 2, 2015 at 12:00 am Hi Larry. Someone flipped a breaker during a restore session and I almost cried when I got the error that my encryption made my drive useless. But it certainly had sufficient detail to get my drive working again, without having to incur the cost of an RMA.
Best regards Birdeen March 5, 2015 at 11:28 am Thank you! John D. DON'T DO ANY OF THE FOLLOWING IF YOU ARE NOT FAMILIAR WITH THE COMMAND LINE AND UNIX - ELSE YOU CAN DAMAGE YOUR COMPUTER SERIOUSLY. I formated my HDD from hfs to fat.
I named it as LaCie, and selected 1 Partition - Mac OS Extended (Journaled). I suggest you need to know whether it's the new drive that's faulty or the motherboard on your computer before returning the drive for a replacement. Step 4: Now, click on start scan button. Volume Erase Failed Couldn't Open Disk Gemsbok Apple Tips and Tricks 3,235 views 6:11 Solution Disk Erase Failed with error Couldn't unmount disk mac - Duration: 3:28.
Topher Kessler Post authorApril 6, 2014 at 6:54 pm Repeating the "cat /dev/random > /dev/disk4" command at the root prompt will require timing. Apr 22, 2012 4:39 AM Helpful (0) Reply options Link to this post by Shootist007, Shootist007 Apr 22, 2012 11:52 AM in response to goldish Level 6 (16,660 points) Apr 22, Note down the disk identifier. http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ The error, which is thrown, is the: ‘Disc erase failed couldn’t unmount disc.' or ‘Disk Erase failed with the error: Couldn’t unmount disk.’ The error occurs in such situations like formatting
Reply Sheryl Brown March 7, 2016 I must Thank You for resolving mu issues. Error 69888 Couldn't Unmount Disk After flashing it (which formats it as well), the pendrive works fine. Reply Vishal December 2, 2015 Hello Iggy, Thanks for writing to us. 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.
I guess that gives me another path to investigate but if you have any new advice to offer, I would be very grateful.
Since you can boot from a thumb drive, your computer will apparently work from an external drive. Partition Failed Couldn't Unmount Disk Mac Restarted and voila! Partition Failed Couldn't Unmount Disk External Hard Drive Use the located device file (arrows) repeatedly in the command to overwrite the disk (B) after you have attached it to the system (click image for larger view).
I recovered 500GB. http://gsbook.org/unmount-disk/partition-error-could-not-unmount-disk.php When this is done, you can then try using Disk Utility to partition and format the disk for use again. MaX April 7, 2014 at 5:41 am Many thanks Topher for your comprehensive reply. Interrupted read/write operation: The chances of Mac file corruption or deletion also takes place when we interrupt the ongoing read/write process in midway resulting in Partition Failed Could Not Unmount Disk Can't Unmount Disk Mac
In the right hand pane (RHP), First Aid has everything grayed out as does the Erase tab while the Partition tab shows the Current partition is "OS X Base System", formatted It is failing every time. In general, click on "Macintosh HD". get redirected here You might erase this disk but this will lead to loss of data and erase process may end up unexpectedly.
Perhaps typing insults is the limit of your skill set and actually using a complex process like this one is beyond even your imagination. Disk Erase Failed With The Error Couldn't Open Device B. Corruption in header file: Header file are one of the crucial file that contain entire information about the file that you are going to access.
Furthermore, Mac data recovery software has been well developed with layman prospective to provide simple working environment for the beginner users too. Then Terminal stopped not showing mure of such last line (no other message shown). Alex January 14, 2015 at 12:53 pm Hi, I am booting my Mac using an external disk. Force Unmount Mac These allow programs to interact directly with the device, so for instance you can use a filesystem manager like the "diskutil" command to get information on, or fix a device.
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. The current situation is thus: I plug into a USB port, the activity light comes on, sometimes steady, sometimes flashing to indicate communication with the Mac, until ultimately (up to 10 Run the following command to attempt to overwrite the contents of the device file (which is the contents of the disk). useful reference Reply Alysia March 15, 2016 I'm trying to format a new external hard drive and it is not working.
Here is how you should proceed 1) Download Stellar Partition Manager. Usually on the Mac this would be with a GUID partition map. At this point you can open the Disk Utility program and you should see your drive with no storage volumes available. But, the important point to remember is that the installer or the recovery drive must reside in the drive, separate from the primary boot disk with the installed OS on it.
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 Lloyd Smith June 18, 2016 at 4:58 pm Ooops! There are just no dots or asterisks to indicate so. It may take a few attempts but it should be doable.
Resolving Disk Utility errors through Recovery Partition First of all reboot Mac by holding "Option” key down along with choosing recovery partition. MaX April 10, 2014 at 7:57 am Thanks. Choose the destination drive which has the problem. That operation errored out (that was the first time the "last block of drive" message appeared), the named partition disappeared from the navigation in disk utility, the drive stopped mounting/being readable
Please try again later. Watch Queue Queue __count__/__total__ Find out whyClose Disk Erase Failed with the error: Couldn't unmount disk - FIX Mac acguevara SubscribeSubscribedUnsubscribe33,67633K Loading... Tried every single thing above. Enter your email address below: Related articles: Dual Boot OS X 10.9 Mavericks and OS X 10.8How to Resolve a "Partition Failed" Error in Mac OS XHow to Verify (& Repair)
You can resize the Macintosh HD as required.