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How to edit file /etc/fstab


This is how the my fstab file is looks like which is placed inside the etc folder in the Linux Folder structure.


You can overcome some problems by editing this file.




# /etc/fstab: static file system information.
#
# Use 'vol_id --uuid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
#
proc /proc proc defaults 0 0
# / was on /dev/sda8 during installation
UUID=64839f40-b2f1-412f-ae1a-c5a213ba449a / ext3 relatime,errors=remount-ro 0 1
# /home was on /dev/sda7 during installation
UUID=2ab422e9-b37d-4e7e-966f-6ca7d1d081cf /home ext3 relatime,errors=remount-ro 0 2
# /boot was on /dev/sda6 during installation
UUID=faaab6f9-539b-4f1a-82fc-b5a18887d28d /boot ext3 relatime,errors=remount-ro 0 3
# swap was on /dev/sda5 during installation
UUID=ab5f806d-8f4e-42b9-b67b-5618e9715585 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0


Now we can study a line what it contains


# /home was on /dev/sda7 during installation

UUID=2ab422e9-b37d-4e7e-966f-6ca7d1d081cf /home ext3 relatime,errors=remount-ro 0 2

This line contains following parts



  1. # /home was on /dev/sda7 during installation
  2. UUID=2ab422e9-b37d-4e7e-966f-6ca7d1d081cf
  3. /home
  4. ext3
  5. relatime,errors=remount-ro 0 2

Now let me consider each one of these.

Actually I have separate home and boot partitions.

And when I installed linux for the second time I had to edit this file to use them as the actual home and boot partitions.



Part 1
This says that where the partition was in at the installation. In my case the partition is in sda7. It is said by the "dev/sda7"


Part 2
First of all launch the Partition Editor Software.

You can find the UUID of any of the partitions from right click the partition and select information at the Partition Editor Software.

Part 3
This part says where to mount the partition. Example is this sda7 partition has mounted as the home.


Part 4
This says about the file system about the partition. In this example case home partition contains the ext3 file format.


Part 5
I also don't know the exact meaning of this line. But it contains
options       dump  pass

options can have values of errors=remount or defaults
errors=remount is used only for the root partition
But if u want u can use that option for any partition
Next two numbers represent dump and pass
It can have following variations

0 0 for /proc and swap
0 1 for root
0 2 for others

You can see that last two lines is bit different because they are for swap partition and cdrom. Don't edit them if unless you really needed and u know what to do there.


Most probably you will need to restart twice after editing this to make it work. Don't get afraid if it doesn't work at the first time.





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