First of all, thanks a lot for replying.
The idea is not to add a new hard disk, but to claim a 5GB partition from the existing hard drive and increase space for my fedora OS. I use a dual boot(the other one being WindowsXP).
I created the 5GB partition(unallocated) from Windows(XServer in Fedora is down).
I remember once I tried tinkering around with the fdisk utility, I met with failure with all contents being wept out.
The article you posted indeed is informative for adding new hard drives.
I shall reframe the question again:
How to allot a 5GB partition(from the existing hard drive, already unallocated space) and increase space for my fedora OS by adding it to /?