From here http://www.tecmint.com/centos-7-installation/ item 11NOTE:For those users, who have hard-disks more than 2TB in size, the  installer automatically will convert partition table to GPT, but if  you wish to use GPT table on smaller disks than 2TB, then you should  use the argument inst.gpt to the installer boot command line in order  to change the default behaviour.Could anyone explain in detaila how to add inst.gpt argument and when. Let's suppose I switched on computer and inserted Centos DVD. What's next?
Centos 6-7 install argument for GUID Partition Table
linux;centos