http://lmgtfy.com/?q=what+is+gpt+mbr

Thanks for that but do GPT drives have an MBR Code (tried looking it up)
If you did either

your searching skills fail badly
If this is the case, improve them > https://support.google.com/websearch/answer/134479?hl=en

or

you do not have the basic knowledge to understand things.
In that case > Here are some sites where you can find a huge amount of information about things.

http://www.howstuffworks.com/
http://www.howtogeek.com/
http://www.tomshardware.com/