Hello,
I'm booted on a MacBook Pro from an external drive, and I want to erase the drive inside the MacBook using Disk Utility from the external. For some reason or another, it won't let me do this.
When I click on the Erase tab (whether clicked on the disk itself or the volume "Macintosh HD") and try to erase it, it returns with the error:
Disk Erase failed
Disk Erase failed with the error:
Could not unmount disk.
When I try to install an image onto the drive, I get a similar error, except it says "Operation not permitted."
When I tried it while booted with an OS X DVD, it worked fine.
As far as I know, I should be able to do this while booted from the external HD.
Any solutions to this problem?
Thanks,
Jason
I'm booted on a MacBook Pro from an external drive, and I want to erase the drive inside the MacBook using Disk Utility from the external. For some reason or another, it won't let me do this.
When I click on the Erase tab (whether clicked on the disk itself or the volume "Macintosh HD") and try to erase it, it returns with the error:
Disk Erase failed
Disk Erase failed with the error:
Could not unmount disk.
When I try to install an image onto the drive, I get a similar error, except it says "Operation not permitted."
When I tried it while booted with an OS X DVD, it worked fine.
As far as I know, I should be able to do this while booted from the external HD.
Any solutions to this problem?
Thanks,
Jason