Mount-Unmount in Linux

In Linux, we can not access a device directly. To access a device we need a certain point on our system, from where we can access that device, and that certain point is always a 'directory'. We can access any device by mounting it with a directory.

To mount a device or partition, the mount command is used. We can mount devices temporary or permanently.

Lets see how to mount device temporary:

you can mount a partition with any directory ,Temporary or Permenent.

Temporary mount

The mount command provides large number of options and the common pattern for mount command is shown below.

To mount a partition,run:

[root@localhost ~]# mount /dev/sda4 /abc

To mount cdrom, run:

[root@localhost ~]# mount /dev/cdrom /mnt

To check whether the partition has mounted or not, run following command

[root@localhost ~]# df -Th

if you wanna detach it, run the following command

[root@localhost ~]# umount /abc

Note: After reboot,the partition will detach automatically

Permanent mount

The /etc/fstab and edit it

[root@localhost ~]# vim /etc/fstab

/dev/sda4 /mnt defaults ext3 0 0

save and exit the file

Now run mount command

[root@localhost ~]# mount -a

Now if you wanna detach it again, then you have to remove the above lines from the fstab file and then you have to run the following command

[root@localhost ~]# umount /abc

Note: If you dont wanna detach the partition,then dont remove the entry from the file,,it will still work after reboot. Keep in mind,not to change any other entries of file,bcoz it can lead your system to unbootable condition.