#Mac os x could not unmount disk mac os x#

For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one of the force eject methods. I quit the terminal window when I finish doing the backup. You can mount and unmount drives, volumes, and disks from the command line of MacOS and Mac OS X. To begin, you must open the Terminal application. You can also burn to a CD, boot it and try to format your external HD from it. See What is the ‘Mac OS X Base System’ disk image on my 2011 Macbook AIr To get an explanation.

#Mac os x could not unmount disk mac os x#

The script runs just fine, but when the backup is completed, I drag the desktop image of the FireWire drive to the trash to unmount it and get a finder alert saying 'The operation could not be completed because the disk 'backup disk' is in use.Īny ideas what the problem is? I don't have any applications running that I know of that use the backup disk. I show in this video the solution to the disk disassembly problem in macOS.Solution Disk Erase Failed with error Couldnt unmount disk mac error 69888PTBR -. You can also try to fix the couldn’t unmount disk mac OS problem by using the command line to force the disc to be unmounted. The Mac OS X core system image is not the cause of your problem. Generally this error appears when the file in some partition is. I've been using a Unix script to back up my internal PowerBook drive to an external FireWire drive. But the good news is that it is possible to overcome from error-10000: could not unmount disk.