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External Hard Drive Partition Failed Could Not Unmount Disk

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Now the pendrive shows both the drive and the single volume inside on the left pane of Disk Utility, as did before doing what is indicated in your article above. It if truth be told was once a enjoyment account it. Nuvi November 18, 2014 at 5:10 pm Thanks this worked perfectly! Then select the desired external drive from the startup manager screen and press the enter key. have a peek at this web-site

Jefferson Le Blanc June 18, 2016 at 3:21 am @ John D: It may not be possible to determine at this late date, but I'm curious how the drive got corrupted Any idea how to repair or format it? 
Thanks. 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 Solution There are many solutions when the user faces these problems. https://discussions.apple.com/thread/5812340?tstart=0

Couldn't Unmount Disk Mac

That fell over (I don't recall specifically why). xhoenner December 14, 2014 at 4:41 pm Thanks a lot for that very detailed post, I was about to contact the manufacture (WD, My Passport 2TB). I know the easiest thing to do is to simply trash the drive but I hate to do that if there is any chance at all of retrieving it.

Reply joe says: May 4, 2016 at 5:58 am Thank you! This was driving me crazy. Please reload CAPTCHA. × = Notify me of followup comments via e-mail. Error 69888 Couldn't Unmount Disk 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

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 Partition Failed With The Error Couldn't Unmount Disk But you can change that setting. Crazy 8s Code Golf Is the effect of dollar sign the same as textit? 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'

George W. 4th November 2015 at 1:16 pm · Reply >Alysha S. (9th August 2015 at 7:12 pm) >I’ve got mine booted into a Yosemite installation USB. Couldn't Unmount Disk External Hard Drive MaX June 1, 2014 at 11:51 pm Topher, as I said above, it would be great if you could write an article about it (flashing pendrives). We aren't there, yet. See if this lets you erase the drive.

Partition Failed With The Error Couldn't Unmount Disk

Reply Sheryl Brown March 7, 2016 I must Thank You for resolving mu issues. Ignatius College Prep Tech Blog on Another opinionated guide to Munki manifestsAlan Siu on Absolute beginner's guide to setting up Munki (not monkey)Sam K on Absolute beginner's guide to setting up Couldn't Unmount Disk Mac It may take a few attempts but it should be doable. Volume Erase Failed Couldn't Open Disk Never can understand while people do not maintain at least one bootable external drive and consider DiskWarrior to be useless.

It is advisable to immediately scan your HDD with Stellar Phoenix Mac data recovery software and avoid overwriting any new files to the drive. Check This Out The above steps did the trick and everything was working again as expected. Please tell me what should I do now? 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. Disk Erase Failed With The Error Couldn't Open Device

However, on the last attempt, as I write this post, I now have "cat: stdout: Device not configured"! "diskutil list" still shows the disk as /dev/disk1 and it is still showing Topher Kessler Post authorJune 1, 2014 at 8:29 am By reformatting your drive you wiped out the indexes that tell it where files are on the drive. Bit more drastic, but you can attempt to force a volume or the entire physical disk to unmount: FOR A VOLUME: 1) Using the Terminal application again, booting from OS X http://jessriegel.com/unmount-disk/formatting-external-hard-drive-for-mac-could-not-unmount-disk.html Along with all of the icons for the apps in the dock, and half of them failed to appear.

Members have access to different forum appearance options, and many more functions. Can't Unmount Disk Mac No doubt the time you spent on this was worth far more than the cost of the drive, but nothing can match the satisfaction of solving such a difficult problem. Then, further install the OS X on it 5.

Verifying and repairing partition map for “LaCie XtremKey Media”Checking prerequisites Problems were encountered during repair of the partition map Error: Some information was unavailable during an internal lookup.

Twitter Facebook LinkedIn YouTube Book a Repair Book a Course 020 8660 9999 - [email protected] Home Xmas 2016 Repairs iPhone repairs Mac repairs Other repairs BusinessFirst Centres FAQ Prices Training Courses B. 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 Erase Process Has Failed. Press Done To Continue Apple Hardware Apple Desktops Apple Notebooks Apple TV Other Hardware and Peripherals Developer Playground iOS Development OS X - Development and Darwin « Previous Thread | Next Thread » Thread Information

Good luck - Dave Reply With Quote 09-15-2014,02:53 PM #3 chscag View Profile View Forum Posts Member Since Jan 23, 2008 Location Keller, Texas Posts 50,462 Specs:Late 2013 27" iMac, iPad ends in 3 days Linked 0 USB drive appearing as two different devices Related 2Broken FileVault Drive0Why do I have /Volumes/Storage Drive?8I think I messed up the Fusion Drive on my 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 http://jessriegel.com/unmount-disk/format-external-hard-drive-mac-error-could-not-unmount-disk.html The solution lies only in using a separate USB drive for fixing the error.

So the first thing to do is to startup the Mac from another bootable drive such as an external drive or OS X Recovery. Anyway, once again, DiskWarrior to the rescue. OK, we've tried to be nice, but is the disk STILL not letting you work with it? I can see the drive in Finder, but some times the folders appear to be empty of files, and sometimes I can see the files but cannot access.

I've thrown the USB onto a Windows PC and reformatted as a FAT32 first and it works. Note down the disk identifier. Can it be any usb? Disk utility does recognize but will not allow mount.

Thanks so much Kappy and Dr. Required fields are marked * Prev Post Next Post Subscribe Sign up for news, views and offers and more from our expert team Popular posts Recent PostsMost CommentedMost ViewedOpenSSH updates in Jan 21, 2014 2:26 PM in response to studio_ Level 3 (636 points) Jan 21, 2014 2:26 PM in response to studio_ To list all the drives and their accompanying partitions I've tried the original text and the one you suggested to Jon and it still says ‘command not found' Any ideas what's up?

Jan 21, 2014 2:26 PM Helpful (0) Reply options Link to this post by Kappy, Kappy Jan 21, 2014 2:26 PM in response to Dr.Mac. Thanks. This should then allow you to partition and work with the physical disk again. 1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive. Have you contacted LaCie about the problem?

Jefferson Le Blanc June 17, 2016 at 1:30 pm @ Jason Watkins: It's not clear which post you are referring to, the one just before yours regarding using a Windows PC 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 When I try to erase it from there I get Disk Erase failed with the error: POSIX reports: The operation couldn’t be completed. B.

After changing the security options and trying to format, it finally said there were errors on the disk. If you have an external bootable disk, connect this to your Mac and power your Mac up whilst holding down the OPTION/ALT key. How to select a number from all the integers list? Tried every single thing above.