Sda solve centos installation must have a GPT disk label

When prompted when installing CentOS 6.5: sda must have a GPT disk label

Do the following Resolution:

Time without partition

Press Ctrl + Alt + F2 to enter the rescure mode
mklabelgpt / dev / sda
Print / dev / sda

Press Ctrl + Alt + F6 return to the installation interface

Then partition and other operations can be completed successfully.