Mac terminal command unmount disk

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Partition sizes can be specified in gigabytes with the G suffix 2 G or terabytes with the T suffix 2 T. Volume1 and Volume2 will each take up 25 percent of the disk, and Volume3 will occupy the remainder. You can see the results of the operation at the end of the Terminal window to determine everything went okay. Your email address will not be published.

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Notify me of follow-up comments by email. Notify me of new posts by email. You are here: Using diskutil. Comments how about an example of a partition disk example with just 1 volume. Leave a Reply Cancel reply Your email address will not be published. Went back to disk utilities, erased it this time it did not complain at all , re-installed OS. Very smooth. Thanks a lot. I got same error: This lists which process is run on the drive?.

Mount & Unmount Drives from the Command Line in Mac OS X

Then use activity monitor to force the process to quite and then redo the partitioning. This resolve my case. Thanks a lot!


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It worked! I had a Mac Mini that I needed to reformat and could not get the disk to unmount. So I found this page and tried everything. No joy. I was able to force an unmount and could wipe the disk.

Same troubles here, just trying to wipe and do a fresh install at this point. Doing the list command shows up to 15 disk images? I recovered the data via Target Disk Mode, then got stuck with the above error. Found this page and it was persistence that got me past the problem. It took 5 repeated attempts with a Restart after 3 goes, but eventually worked.


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I used this link to join them back together — http: Your email address will not be published. Subscribe Sign up for news, views and offers and more from our expert team. Posted on 7th May by Amsys. Then select the desired external drive from the startup manager screen and press the enter key.

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Disk Utility Tip: Fix 'Couldn’t Unmount Disk' Errors

Also perform a permissions repair if required. Still not playing ball? At the unix prompt enter: Any help will be appreciated Thanks Lalitha. Too complicated! We need help, too!! The command line approach to mounting and unmounting drives is intended for techies, of course it is complicated. There is no requirement to use the command line for anything at all on the Mac. Novice users can eject a disk through the Finder, or plug it into USB and mount it that way.

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Mount and Unmount Disks in OSX Terminal