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There Was An Error Preparing The Time Machine Backup Disk Couldn't Unmount Disk

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Up next Solution Disk Erase Failed with error Couldn't unmount disk mac - Duration: 3:28. Enjoy this tip? Why is international first class much more expensive than international economy class? Dec 11, 2009 I've got an 8GB Sony Micro Vault Pen Drive that's stopped working. navigate to this website

I booted from the recovery disk, went to Disk Utility and erased the two partitions. It immediately mounted as it should as the lighting bolt plugs are reversible. Wonder if this is something happening in Yosemite/El Capitan; never had this problem previously. Unfortunately my girlfriend obviously had something mightily important to check on Facebook and casually removed the hard drive mid backup.

There Was An Error Preparing The Time Machine Backup Disk Couldn't Unmount Disk

Enter your admin password if prompted. In that case, you'll need to boot from a separate USB drive to fix the error. Reply uzz says: July 21, 2016 at 1:05 pm You don't need any boot drive nor recovery partition utility to fix this error.

I tried erasing the disk but that also did not work (error message: Couldn’t unmount disk.) It sounds like my hard drive has failed (or is in the process of failing) Feb 26, 2012 I am trying to reinstall Lion on my macbook pro, but every time the hdd shows up as 'locked' and when I attempt to format it, it gives I have a 2010 iMac with a 1.5 TB Seagate external hard drive I use for Time Machine as well as other backups. Guid Partition Map Snazzy Labs 534,814 views 9:31 How to Wipe & Restore a MacBook Pro/Air to Sell - Duration: 4:20.

This can happen during partitioning, disk verification and repair, and even during formatting, and there's usually little to no additional information provided as to how to resolve the problem or even Disk Utility Couldn't Unmount Disk External Hard Drive 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 iMac 27 inch , iMac 21 inch, Macbook 15 inch, Macbook 13 inch. http://apple.stackexchange.com/questions/128870/unable-to-mount-time-machine-partition USB sticks work fine.Info:Mac Pro, Mac OS X (10.7.3) View 1 Replies View Related Hardware :: Unable To Reapair External Disk / Unmount Error Jun 22, 2008 I have a Western

But, then, as I tried to use the drive as a time machine for my new Macbook Pro, it would always say the the drive was full. Unable To Write To The Last Block Of The Device I recently got the Samsung G3 Station 2T (as a back up to the buffalo) and Time machine says "There was an error erasing the Time Machine backup disk "SAMSUNG”. share|improve this answer answered May 2 '14 at 10:55 jpoh 3173418 add a comment| up vote 0 down vote I rebooted the iMac and replugged the WD Time Machine 3 times Select Mac OS Extended (Journaled), which is the default, give it a name, and then click Erase….

Disk Utility Couldn't Unmount Disk External Hard Drive

Windows, however, won't be able to write to this volume anymore.

All Rights Reserved. There Was An Error Preparing The Time Machine Backup Disk Couldn't Unmount Disk His OS X and iOS tips have been some of the most popular posts on the blog. Format Drive For Time Machine From the listing, look in the Identifier column for your disk identifier.

Wondering if it simply might be the cable connection I twisted the cable so I could insert the plug into its reverse position. http://linuxprofilm.com/time-machine/time-machine-couldn-39-t-complete-the-backup-an-error-occurred-while-creating-the-backup-folder.html I'll start from the start: I had been using a Western Digital external drive as a host for my time machine on my old 2007 Macbook with no problems. Register Now London:020 8645 5803 Surrey: 0208 660 9999 Manchester: 0161 277 9600 © Amsys Ltd, Registered Office: 44 Poland Street, London, UK, W1F 7LZ Tel: 020 8660 9999 Email: [email protected] I go to disk utility and both partitions are visable, KAINARC is mounted but JUNGLEMAC is not. Disk Utility Unable To Unmount Volume For Repair

Open disc utility find my external drive , that will not un mount or partition. Is this a simple case of a failed drive (perhaps a defective product) or is this a symptom of a software related problem (e.g. 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) my review here If all else fails, start your Mac up from a different source:  the Recovery HD on Lion 10.7.x or later (see Using the Recovery HD), or your OSX Install disc (Software

I was able to force an unmount and could wipe the disk. Format External Hard Drive Mac iDB 28,775 views 1:29 Mac Monday: Erase & Partition with Disk Utility - Duration: 7:10. g.When you've got everything the way you want it, click Apply and wait a few moments for the process to complete.   Previous         Frequently Asked Questions        Home        Troubleshooting       Contact        Next If

When I open Time Machine, it does not show my hard disk as an option that can be used for backup.

I'm having a problem unmounting an external hard drive. OK, we've tried to be nice, but is the disk STILL not letting you work with it? Home Submit Resource Tracker Forum Advance Search OS X :: Formatting External HD - Could Not Unmount Disk Aug 19, 2008 When I try to format my Western Digital "MyBook" external File System Check Exit Code Is 8 Looks like it starts erasing, but then quits and says at least one volume could not be unmounted.

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 Note that this will erase all data on the drive. reading and writing (I've already copied all my data off it) I can't seem to either eject the disk or unmount the partition that is mountable. http://linuxprofilm.com/time-machine/time-machine-backup-failed-disk-read-only.html 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

If I'm being stubborn I would try to find a good disk repair software and run that to diagnose the drive before doing the RMA-process. This will not work if the error was triggered by attempting to modify the boot disk through partitions or formatting, and you will need to use the method above instead. If so, see question #3 or question #4 before proceeding.  If you're making two or more partitions, it's usually a good idea to put your Time Machine partition first, so it’s