What they said ^ , but with one exception. IF there is data on the old HDD that you want, you do NOT have to re-Partition and Format that drive. When you do install it (AFTER getting it running with only the SSD, as suggested), you should find it in My Computer ready to access and use. Just to be sure, you can go into BIOS Setup and find the Boot Priority Sequence setting spot. Make sure that you are booting from your SSD, and the old HDD is NOT allowed to be used for booting.