Hi,
I have started Linux,
can somebody help me in explaining fstab.
I have studied but just want to know more.

Thanks
Mahabalesh

The link below gives an explanation of fstab and what the different fields are for:

http://www.debianhelp.co.uk/fstab.htm

Instead of using /dev/sd* to label partitions, many modern linuxes use UUID=9efdfa59-d05a-49bf-a158-a92de1d56f24 and such to identify drives, which means you need to note which partition does which. You can overwrite the UUID= information with /dev/sda5 or whatever for clarity and it should still work. This is a handy tip when a computer goes into administration mode on boot after you have been playing with your hard disks.
Use blkid /dev/sda* as root to list all of your UUID information for your first hard disk if you want to correct the UUID number.

This is an excellent tutorial on using UUID in /etc/fstab.

http://www.cyberciti.biz/faq/linux-f...-update-fstab/

I would suggest you start by learning how to configure fstab, then move on to UUID.

Thanks.. it helped me lot..
and can anybody help me with how to delete partition ?

Some Linux distributions will include GParted or another disk partitioner. You haven't indicated which of the hundreds of different distributions you are using so there is no way for us to know if you have it. The link below has a detailed tutorial on using GParted and other partitioners are similar.

http://www.dedoimedo.com/computers/gparted.html