I have Lion OS but I need to format my disk. How to do it?

Helpppp
I need to format my Mac book Pro
I have the OS Lion and it doesn't let me format the disk!

It is not necessary to create an external boot device.
Restart your computer while holding the option key. After the startup chime you will see your available boot volumes. Choose Recovery HD. (You might be able to start up with command-r to boot directly into the Recovery HD emergency partition, but I have found that only the most recent Macs will respond to this key combination.) Once boot is complete, look under the menu bar's Tools for Disk Utility. Start up Disk Utility, choose your main hard drive partition, and reformat to your heart's content.
You won't be able to perform certain partitioning tasks when booted this way, but you can do nearly everything that you could do if you were booted from an external device or optical disc.

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I have Lion OS but I need to format my disk. How to do it?

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