I am buying a Asus N56JN notebook and it comes with a HDD and CD drive. I'm replacing the CD drive with a SSD. My question is what do i do after i have migrated/reinstalled Windows 8.1 (which comes on the already installed HDD) onto the SSD? Do I format my HDD? Do I have to erase the windows 8.1 that is on the HDD since I'm now booting from my SSD? Thanks.