How To Unmount Disk in Linux, Ubuntu, CentOS with umount Command
Linux distributions like Ubuntu, Debian, CentOS, RHEL and others uses disks by mounting them to the file system. We have all ready examined
mount command in the following tutorial. In this tutorial we will learn how to umount the disk in a Linux system.
Before unmount we should be sure that all changes are written to the file system and disk. So we need to close opened files those resides in file system we want to unmount.
umount command help information can be listed with
--help like below.
Umount Specified Partition
We will start by unmounting specified partion. We can unmount just providing the partition path. In this example we will unmount
/dev/hda1. We need root privileges in order to complete this job.
$ sudo umount /dev/hda1
Unmount All Partitions
If we need to unmount all partitions of file systems currently mounted to the Linux system. We will use
-a option which means all .
$ sudo umount -a
Force To Unmount
In some cases write operation can be resume for a long time and we need to unmount file system. So we can force
umount command with
-f option like below.
$ sudo umount -f /dev/hda1
umount failed we can find detailed information about the reason. We can use
-v option which will list detailed information while try to unmount.
$ sudo umount -v /dev/hda1