Thanks for replying!
I don't want to put the OS on the SSD because I'm going to use it as a cache for my HDD. That's what the Intel Rapid Storage Technology does.
But now the computer won't boot up properly at all... My dad had changed the boot priority to the optical drive, and when I changed it back to the HDD, it didn't work. I think I'll just reinstall the OS like you guys said and re-do the Rapid Storage Technology.