Lastly, if all above options and methods failed for you, you may try the final method reboot or SysRq or hardware resetting to reboot you Linux. This verb gives up and returns failure after a maximum of 1 minute in most situations. Up to a few seconds (or more) may be required for any Disk Arbitration dissenters in the system to approve the unmount, and/or for the file system to flush data. A device is in use if any file is open for any reason or if a users current directory is on that device. Force will force-unmount the volume (less kind to any open files see also umount (8)). Flags Note: You cannot use the umount command on a device in use. Use ' stopsrc -s cdromd ' to disable the CD/DVD automount daemon. Then you can continue to umount the filesystem. Use the cdumount or cdeject command to unmount an automounted CD or DVD. mnt/data) by # fuser /mnt/dataįuser can also help you kill all processes using a filesystem at the same time by # fuser -k /mnt/data You can find out the processes using a filesystem (e.g. After the processes are killed, the filesystem will be able to be unmounted. If you are sure that it is safe to kill the process, you may kill them by kill or kill -9. It will output lines like bash 17622 user1 cwd DIR 253,2 4096 2 /mnt/data II 2.th Way To Unmount Volume Manually via SSH. (In Mac OS X 10.4 or later, you must select your language first.) Important: Do not click Continue in the first screen of the Installer. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. Here, we use the mount point /mnt/data as an example. I How To Solve Examination Failed(Cannot unmount disk) Error With Unmounting Volume With Qumount. Insert the Mac OS X Install disc, then restart the computer while holding the C key. You need to run the following command as root. The following command finds out the processes accessing the partition/filesystem. (For example to Erase/Partition the disk). This should force unmount the entire physical disk and all its related volumes: 3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. Here, we introduce 2 common methods with 2 common tools. sudo diskutil unmount force /dev/diskx 2) Press RETURN. Type in this command next: sudo diskutil unmountDisk force /dev/diskx. If the reason is that processes are using the filesystem, we can kill the processes using the filesystem and then it will be fine to unmount it. Look for the disk that you want to force unmount and take note of the number of the drive. Option 2: Kill the processes using the filesystem and then unmount it Please be aware that programs may not expect a force or lazy unmounting and these options may disrupt running processes using the filesystem, cause data loss or corrupt files opened. The -f option is for unreachable NFS system. Force an unmount (in case of an unreachable NFS system).
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