I know the difference between RAID and AHCI is that RAID is for people using over one harddrive or SSD. I am just wondering why people do it. Is RAID faster than AHCI when using two HDD/SDD? Or is it just fail safe? I am not sure why people use RAID. I am using AHCI right now with one HDD and one SSD and I am wondering if its worth it to reinstall Windows 7 all over again for the benefit of RAID. I tried to search online but can't seem to find any information that I can understand. A lot of the topics are using big words I don't understand. I am looking for a simple answer that a noob can understand. I'm using an Intel Core i5 2500k with a GIGABYTE GA-Z68XP-UD3 motherboard. I have a harddrive and a SSD (Crucial M4 64gb) Also if you do suggest to reinstall Windows 7 in order to use RAID, how should I enable RAID? In my BIOS, I saw that there was a "GSATA3 CTRL" option to switch to IDE, RAID, or AHCI, and then there was a "PCH (something else forgot what it said)" and it had the options of IDE, RAID, and AHCI. Currently both of them are set to AHCI, so if I wanted to reinstall for RAID, would I switch both to raid? Thanks for your help.