Please choose the type of hard drive you will be using to build the system. If you have an IDE hard drive (also known as ATA or PATA) then choose IDE. If you have SATA ( Serial ATA) hard drive then choose SATA. If you don't know what type hard drive you have, then look at the image below and choose the one that matches your hard drive.

Next - IDE Hard Disk Drive Installation

Next - SATA Hard Disk Drive Installation