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Format External Hard Drive Mac Error Could Not Unmount Disk

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The errors could have been unresolvable without a boot drive. First, ChipGenius_v4_00_0027_pre2 from http://dl.mydigit.net/2010/09/chipgenius.html says: Description: [F:]USB Mass Storage Device(LaCie XtremKey) Device Type: Mass Storage Device Protocal Version: USB 2.00 Current Speed: High Speed Max Current: 2mA USB Device ID: VID Typically the "Couldn't Unmount Disk" error pops up when the currently boot drive is being modified, thus the easiest solution is to boot from another drive and run Disk Utility from Jefferson Le Blanc April 10, 2014 at 12:42 pm I checked out those drives on Amazon - I can see why you‘re trying to restore it. have a peek here

Reply Nicola says: July 26, 2016 at 4:43 pm Thank you!! Cannot run CTRL-C command. Ninad Desai January 3, 2015 at 3:41 am Hi , I am getting error "stdout: Input/output error"; I tried it several times … its this error or else "Operation not supported". Hope this helps. http://osxdaily.com/2013/06/14/resolve-a-couldnt-unmount-disk-error-in-disk-utility/

Volume Erase Failed With The Error Couldn't Unmount Disk

If this works it should solve the disk is busy problem. Some had a problem here or there, and for others it didn't work at all. But they are Windows apps - you'll need access to a Windows PC or a virtual machine in Parallels of VMWare Fusion. I get "cat /dev/random > /dev/disk0" to run successfully and the disk appears fine in Disk Utility, but the partitioning using Disk Utility stucks at 50% and if I reboot the

I am running iMac 2011 OS X 10.9. I guess I've been lucky. This was driving me crazy. Error 69888 Couldn't Unmount Disk Any OS X boot drive is needed to complete the task.

Reply Scott says: February 12, 2016 at 1:43 pm Great tip. Volume Erase Failed Couldn't Open Disk Bu videoyu Daha Sonra İzle oynatma listesine eklemek için oturum açın Ekle Oynatma listeleri yükleniyor... The flashing tool found that it had one bad block (probably the first one, which prevented formatting). http://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/ If you have used our method above to create a bootable installer, choose ‘Disk Utility' from the available menu.

Brad June 11, 2015 at 3:50 pm Thanks. Couldn't Unmount Disk External Hard Drive Your fix has saved me! Reply Johnathan Melton November 5, 2016 Ok trying to wipe the mac pro completely but I can't cause I can't unmounted a partition drive so I tried a bunch Run the following command to attempt to overwrite the contents of the device file (which is the contents of the disk).

Volume Erase Failed Couldn't Open Disk

You can change this preference below. http://technology.siprep.org/fix-for-disk-erase-failed-couldnt-unmount-disk/ If the external El Capitan absolutely refuses to unmount the disk, can you try booting into Recovery Mode (hold down Cmd-R while booting up) and then using Disk Utility there? Volume Erase Failed With The Error Couldn't Unmount Disk 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 Partition Failed With The Error Couldn't Unmount Disk If there's no critical data on it, you may have reached the point of diminishing returns.

Reply Jak says: January 29, 2015 at 5:37 pm Much appreciation! navigate here An then such last error message for all consecutive trials. Thank you again! All rights reserved. Disk Erase Failed With The Error Couldn't Open Device

Why did Tarkin undertake this course of action at the end of Rogue One? I left it all night and got the same result. And hopefully fix it from there? http://jessriegel.com/unmount-disk/formatting-external-hard-drive-for-mac-could-not-unmount-disk.html Let me know if you have any further issues.

After updating to Yosemite my LaCie 3TB external hard drive stopped showing up in Finder and Disk Utility couldn't fix it because it would not mount/unmount. At Least One Volume Could Not Be Unmounted Worked for me this morning. I was an idiot and renamed my home folder and now I'm trying to format my computer because it doesn't recognize me or my password so not only can I not

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'

Jason M. Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! After flashing it (which formats it as well), the pendrive works fine. Usb Boot Drive 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

The reformat procedure even warns you that your data will be lost. 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 This will allow you to fix the problem, regardless of the cause, by one of two means, the first is a sure-thing to fix the issue, while the other only works this contact form All that said, I will save this article because it offers a solution beyond what most disk utilities offer.

Wow! So I found this page and tried everything. If I try to partition the drive, the Apply button is grayed, so I cannot do it (before today it was possible, as described above). PLEASE HELP!!

Seems your hard drive is corrupt and beyond the repair of Disk Utility. Reply TE says: March 26, 2016 at 9:59 am Couldn't get around this problem until I found your solution… Used diskmaker x to make an el capital boot disk then followed Firstly you need to create a boot media using Stellar Partition Manager software. I did Google your error, and came across this workaround.

Jefferson Le Blanc February 23, 2015 at 11:01 pm @ Santhosh Paramesh: From your post it isn't clear if the disk problems you're having are with the old disk or the Enter your admin password when prompted. At the unix prompt enter: diskutil list Press RETURN. Almost.

That being said, it's always a good idea to reformat a new drive before you use it to be sure it's initialized in the desired layout. bala 27th August 2015 at 10:48 pm · Reply Awesome. On a side note, most flash drives are formatted Fat 32 because that is sufficient for the smaller sizes flash drives come in. Reply Alan Siu says: January 26, 2016 at 4:49 pm Try booting into recovery mode (holding down Cmd-R during bootup) and then erasing it from there.

You did find some interesting facts, however. Solution There are many solutions when the user faces these problems. Doesn't simpy unmount the disk work in this case? Thanks again!!!