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Mac Repairing Disk Failed With Error Could Not Unmount Disk

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Thank you! If you want or need to use a drive on multiple platforms, the Mac as well as Windows can read and write to a FAT32 drive, which is sufficient for all If yes, then go to OS X utilities and format the entire hard disk drive. I REBOOTED... http://jessriegel.com/unmount-disk/mac-lion-disk-erase-failed-could-not-unmount-disk.html

Using the above command can interrupt file read/writes, which can cause file corruption. Thank you! MaX April 7, 2014 at 5:41 am Many thanks Topher for your comprehensive reply. Sorry I have no better solution to offer. my review here

Volume Erase Failed Couldn't Unmount Disk

Reply Ian Small says: January 30, 2016 at 2:57 pm Brilliant! PARUSA December 22, 2014 at 12:08 am Hi, with this fix? Thanks. Its not popping up on my macbook pro desktop, im getting the "initialize, ignore etc" error, but its showing in diskutility.

Name (required) Mail (will not be published) (required) Website « Grab the iOS 7 Default Wallpapers for iPhone & iPod touch Evolution of the iPhone & iOS Home Screen » This will bring in the drive menu. 4) Select the newly created boot DVD from this option. 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) Volume Erase Failed Couldn't Open Disk share|improve this answer answered Dec 9 '15 at 6:44 Dannid 20624 Well the disk hasn't worked until today.

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 Vishal February 5, 2016 Hi Tanya, Hopefully you are trying to refer USB boot drive. Worked perfectly after many failed "solutions". http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ Reply Vishal November 11, 2016 If you are unable to boot your system from the other disk, please go through the below solution: 1.

Fixing Disk Utility Errors via Recovery Partition If the Unable to Unmount Error is triggered by first aid or formatting a non-boot partition, you may be able to fix the error Disk Erase Failed With The Error Couldn't Open Device With this effort, the hope is to bypass the corrupted drive logic that is causing the system to hang up when accessing it, but since the drive is captured by the Jonas Hamill Σ (@JonasHamill) March 19, 2015 at 10:58 am Perfect, thank you! Skip navigation Sign inSearch Loading...

Partition Failed With The Error Couldn't Unmount Disk

Find the one you want to force unmount. https://discussions.apple.com/thread/3894449?start=30&tstart=0 Carter August 12, 2015 at 2:33 pm Was having trouble "cat..ing" /dev/random to the disk due to the resource busy response. Volume Erase Failed Couldn't Unmount Disk If that's the case, you can milk more life out of it by installing your system on an external drive and running it from there. Can't Unmount Disk Mac Be sure you backup your files to an external drive or second internal drive, the following procedure will remove everything from the hard drive!

Try again, repeating the "cat /dev/random > /dev/disk4" command rapidly by pressing the up arrow, followed by Enter, to capture the disk between the time it is assigned the device to http://jessriegel.com/unmount-disk/failed-with-error-could-not-unmount-disk.html Just keep typing your password and then hit Enter when you're done. If not, STFU. Usually on the Mac this would be with a GUID partition map. Error 69888 Couldn't Unmount Disk

Reply Alan Siu says: April 18, 2016 at 1:40 pm That's an odd one. Thanks for your answer Topher. Apple - please make your GUI stronger. –oemb1905 Oct 4 '15 at 7:29 Didn't have a volume to unmount; unmounted the disk device instead (with N being 3 in have a peek at these guys An attempt will be made to connect this device to the best available host controller.

Wife Works in LA. Couldn't Unmount Disk External Hard Drive Once you are satisfied with the recovery performance of the software, you can purchase the software through its buy page. Nothing worked, hence my request for assistance.

Now, to restoring all of the icons and the contents of the dock.

This is especially true if you do not hear any tell-tale signs of physical failure, such as repeated click, tap, and whirr sounds coming from the drive at regular intervals. Validate Random Die Tippers Four Birds + One How do organic chemistry mechanisms become accepted? Yet, I cannot partition the drive. Force Unmount Mac there was my 4 years work and now is gone.

Browse other questions tagged macos hard-drive disk-utility partition or ask your own question. Keep it unmounted and then erase in Disk Utility. I also tried to create a new partition, but it fails too. check my blog Jefferson Le Blanc June 18, 2016 at 9:37 am It appears that your system caches got corrupted at some point.

B. Obviously they are, as you report. It is now writing zeros to the drive. –Kray Oct 18 '13 at 17:47 Thanks. This resolve my case.

Reply Lauri says: August 17, 2016 at 12:56 pm I had hoped…. 🙁 Didn't work for me - I've been trying anything and everything to get my external to show back If I open it in disk util I sometimes see an actual name of a partition, but most likely it's not the real name. thank you so much. 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

Create an external boot device (bootable SD card)Here is the link to the procedure I followedCreate a bootable installer for OS X Mavericks or Yosemite - Apple Support2. I AM THEN ABLE TO FORMAT THE DRIVE.TRY SELECTING "STARTUP DISK" AND REBOOT FROM WHATEVER EXTERNAL SOURCE YOU ARE USING.THANKS! This way, if the drive truly is broken, at least your data will be safe. Thank you ! -Bobby Reply Lissett says: October 11, 2015 at 10:19 am Worked for me as well!

Zognoh 806,136 views 3:28 Reset Mac to Factory State and Delete Personal Data Securely - Duration: 2:57.