Explain My Boot Drives To Convert RAID 0 To RAID 1.

Hey everyone,
Recently, I bought a Laptop in which I wanted 1TB Hard Disk Drive but, It came with 2500GB Hard Disks in the RAID 0 Configuration. I am not happy with my laptop, and I want to upgrade it with Two 2TB Hard Disks. Can someone tell me, how I can Convert RAID 0 to RAID 1?
