I am running Ubuntu 13.10. Some links shows that:
If you use an MS-DOS partition table (or MBR), you can only have up to four primary/extended partitions.
If you use a GUID partition table (GPT) with default settings, you can have up to 128 partitions.
How do I find out whether my disk uses MBR or GPT from the terminal in Ubuntu?.
So that it would be easy for me while creating partitions.