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Creating Raid Set Failed Could Not Unmount Disk

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Please download the demo version for a free evaluation. Thanks again for your great help! Got given a Seagate drive as a present, couldn't figure out why it wouldn't work. http://www.stellarinfo.com/blog/repair-mac-hfs-hard-drive/ Hope this helps. Check This Out

The last command will prompt for password. This comment has been removed by the author. 10:31 AM Ethan said... They are unable to erase or partition the drive. great info!

Partition Failed Couldn't Unmount Disk Mac

Georgina February 10, 2015 at 5:02 pm Hi, appreciate your post/help here. MARLON February 16, 2015 at 6:55 pm Hi! DiskWarrior advised no replacement directory was required. Rebooted to the internal drive and ran Onyx.

If you have used our method above to create a bootable installer, choose ‘Disk Utility' from the available menu. It warns me I'll delete data, blah blah. asked 3 years ago viewed 95066 times active 2 months ago Upcoming Events It's the season to ask about recommendations - do it well, please. Error 69888 Couldn't Unmount Disk You could buy a lot of standard and even security enhanced thumb drives for the price of one of those LaCie XtremKey USB3 pendrrives.

Once done, you Mac will start with Yosemite and your disk drive now becomes singe partitioned. Can't Unmount Disk Mac Lol. I'll try the restart. https://discussions.apple.com/thread/3894449?tstart=0 OS X Device files The /dev folder has a number of different device files that are assigned to system components and peripherals, allowing programs to interact with them using system calls.

See How to Answer on how to provide a quality answer. - From Review –fsb Sep 29 at 13:18 add a comment| Your Answer draft saved draft discarded Sign up Disk Erase Failed With The Error Couldn't Open Device Following this, attempt to Erase/Partition the drive again in Disk Utility. Any ideas? Will C++17 support the simpler Range-based For Loop?

Can't Unmount Disk Mac

Another possible symptom is if you get this error or one claiming the drive cannot be unmounted, when trying to format the drive or running a fix routine on it with have a peek at this web-site 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 Partition Failed Couldn't Unmount Disk Mac Worked swell! Couldn't Unmount Disk External Hard Drive Be careful to select and verify the correct disk, as the next steps will erase any data on the drives.

Looks like it starts erasing, but then quits and says at least one volume could not be unmounted. his comment is here Open disc utility find my external drive , that will not un mount or partition. But all that environmental durability is wasted if the drive itself tends to fail. Even though the GUI method for creating RAID volumes is now gone in OS X El Capitan, you can still access the basic underlying technology in OS X to perform most Volume Erase Failed Couldn't Open Disk

In that case, you'll need to boot from a separate USB drive to fix the error. OK, we've tried to be nice, but is the disk STILL not letting you work with it? I named it as LaCie, and selected 1 Partition - Mac OS Extended (Journaled). http://strobelfilms.com/unmount-disk/disk-erase-failed-error-could-not-unmount-disk-lion.html Yet, I cannot partition the drive.

B. Force Unmount Mac Topher Kessler Post authorDecember 22, 2014 at 7:59 am Yes it will. You want to ensure all logic is destroyed on the drive, so it can be re-written from scratch, instead of being interpreted by your system.

http://coriolis-systems.com/iPartition/ B. 9776Jefferson Le Blanc April 10, 2014 at 3:36 am Before reformatting a drive that is reporting mount errors, try restarting your computer.

JrTech 768,546 views 4:09 How to Fix a Corrupt Mac Harddrive in 10.8 - Duration: 3:03. I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go. $ diskutil list disk2 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: To edit the partitions you have the have the higher level drive device media selected. Partition Failed Couldn't Unmount Disk External Hard Drive Regards.

I notice that now when I go back to the erase tab the volume is already showing as "mac os extended (journaled)." 8:48 PM HanSagan said... Once, more thanks a lot for Macissues. B. navigate here Reminds me of the old PC partition days... 4:52 PM Gus said...

Now, press the opt n reboot your system 6. First, XP is very old (as operating systems go) and may not support the necessary drivers for your USB device. Alysha S. 9th August 2015 at 7:12 pm · Reply I've got mine booted into a Yosemite installation USB. Up next How to force a Hard Drive to unmount for formatting in Mac OS X Disk Utility - Duration: 6:11.

Another possibility: Boot in recovery mode and see if Disk Utility can handle the drive from there. The last command will prompt for password. If you don't see a Partition tab between Erase and RAID try selecting the drive in the list to the left. Ha!

You can read the following blog post on HFS drive corruption. 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 Topher Kessler Post authorApril 7, 2014 at 7:01 pm This command should overwrite the partition table, but if the drive is working then the system should be able to recognize it Sorry I have no better solution to offer.

Ignore this warning at your peril. I tried to cat /dev/random and it keeps scrolling and hangs. With the correct disks identified, it's time to build your RAID volume. heavyshark December 16, 2015 at 3:40 pm Trying it again as fast as I can?