How do you install two hard drives in a computer?

Installing multiple hard drives is essentially the same as installing just one. Just slide the drive into the bay and screw it in, and then connect the power and data cables. If you are using older PATA drives, you will also need to make sure, if using the same cable for two drives, that one is jumpered for Master and one is jumpered for Slave. This is not an issue with SATA drives; just plug them in.

Once they are plugged in, you can install an operating system on them. If you are adding a second drive to an already working system, you may need to enter your BIOS and change the boot order so that the original hard drive is still booted from first.