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Formatting External Hard Drive For Mac Could Not Unmount Disk

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Now, take an HDD and format it to OS X extended journal 3. Now switch to root in the Terminal sudo su 6. however, hard drives can and do fail, so I'm extra cautious and keep my all important info incl. ApertureAlley 72,195 views 3:03 How to Erase or Partition a Drive in Mac OSX - Duration: 6:50. have a peek here

Larry August 2, 2015 at 4:56 am Hi Jeff, Your first suggestion didn't work so went to the second. Saved me many times, back to the 8600/9600 days. Reply Vishal November 11, 2016 If you are unable to boot your system from the other disk, please go through the below solution: 1. Reply Owen August 12, 2015 I was installing windows 7 on my Mac through boot camp when Disk Utility showed me a pop-up which says “Unrecognized file system”.

Couldn't Unmount Disk Mac

I rebooted, reset the PRAM, and the drive appeared. 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. Sign in to make your opinion count.

Type "man sudo" for more information. I tried formatting/erasing the 2nd HD numerous times with Disk Utility and it would continue adding time to the process up to 22+ hours. Some of the following steps are destructive and will lose ALL data on your drive. Force Unmount Mac Topher Kessler Post authorJanuary 14, 2015 at 2:01 pm You might try leaving the command running for longer, especially if the drive is a relatively large one.

Reply Vishal November 20, 2015 Hi Sam, To enjoy full features of the Stellar Partition Manager software you need to register the product by purchasing it from the website. Can't Unmount Disk Mac This will bring in the drive menu. 4) Select the newly created boot DVD from this option. Purchased new HD and it initially recognized disk when formatting. You can use "sudo lost | grep dev/disk?" where "?

They‘re expensive. Couldn't Unmount Disk External Hard Drive The vacant space will then be reoccupied with your Mac HD 2. Can it be any usb? I got the message: Your computer was restarted because of a problem.

Can't Unmount Disk Mac

When I restarted the pc , everything dissapeared.

While the device "disk1" is used in this example, be sure to replace it with the device you found in step 2 above: cat /dev/random > /dev/disk1 It is likely that Couldn't Unmount Disk Mac 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 Partition Failed With The Error Couldn't Unmount Disk Possibly so.

When /dev/random is accessed and read, it will output random data. navigate here 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. Topher, it would be great if you could write an article about it. How would people living in eternal day learn that stars exist? Error 69888 Couldn't Unmount Disk

share|improve this answer answered Mar 11 '13 at 6:55 Alex 59811026 add a comment| up vote 0 down vote Yes, ensure no "disk prep" apps are open for the external drive. Enter the following where ‘MacintoshHD' is the name of the newly created Mac formatted partition, and where ‘x' is your disk identifier, (remember to use the ‘diskutil list' command if you 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 Check This Out Hot Network Questions Is the form "double Dutch" still used?

I tried booting up off an external osx drive, and now it won't even recognize the disk. Volume Erase Failed Couldn't Open Disk Please type your message and try again. I had to press the carriage return and then it was saved at "Macintosh HD/Users/~" and the Terminal nano showed [ Wrote 4 lines ]. - At step 6, I got

Daniel Redfern 9,864 views 3:28  Fix: "Disk Erase Failed With The Error: Invalid Request" - Duration: 4:57.

Recently I upgraded to Yosemite. If you can formate the drive on Windows, you can then mount it on your Mac and reformat it HFS+ if you like. Sign in to add this video to a playlist. Disk Erase Failed With The Error Couldn't Open Device This will ensure more of the drive is overwritten by the command, and possibly allow you to recover it.

Does Disk Utility recognize the disk? When it says "Operation not supported," it means the disk4 device file is not yet assigned to the device. Worked immediately. http://jessriegel.com/unmount-disk/formatting-hard-drive-could-not-unmount-disk.html Char August 22, 2016 at 9:44 pm This was a huge help, thank you so much!

Reply Jason says: November 5, 2015 at 8:50 am I tried this method, but now it says "Forced unmount of disk2 failed: at least one volume could not be unmounted" Please You should see some disks appear like /dev/disk0, /dev/disk1, /dev/disk2. Create a single new partition and make sure Options is set to GUID. Because you're looking at blowing away the data on the drive anyway, another method that doesn't require timing is to connect the drive to a Windows machine and open up drive

Simon April 27, 2016 at 2:02 pm Great post! Everytime I try and format, it tells me that the drive cannot be unmounted. This might result in undefined behavior for this device. Thank you very very much.

Click to visit Stellar Partition Manager key registration page Reply Iggy December 2, 2015 I have an EXFAT partition on my 1TB usb hard drive however Stellar Partition Manager You should now be able to erase the drive. If yes, then go to OS X utilities and format the entire hard disk drive. Once you are satisfied with the recovery performance of the software, you can purchase the software through its buy page.

Plug that baby in, then immediately start hitting ‘enter' followed by up-arrow until you start getting "^[[A" instead of errors. I was really starting to get frustrated, but your instructions worked 🙂 Brad June 11, 2015 at 8:31 am I successfully erased all partitions but when I got to reformat in Pants McBrain December 15, 2015 at 7:10 pm Worked like a charm! Wow!

When I selected Initialize, that window disappeared, the activity light dimmed a bit, the drive disappeared from the DU left hand pane for quite some time but eventually reappeared ( but PLEASE HELP!! However, before giving up, run "diskutil list" and see if there are any partitions listed for the faulty drive (there shouldnt be if the above process was run correctly). However, since you are erasing the drive anyway, this doesn't really matter in your situation.