This the simple tutorial on how to install the Samsung 860 EVO 250GB SSD on Alienware X51 R1. This method can also be applied to other PCs or laptops. By replacing the SSD, the speed of the laptop / PC will be much faster than using a hard drive. If you want to use a dual SSD and HDD on your old laptop, you have to use an additional HDD caddy that is shaped like a DVD Drive that is placed exactly in the DVD Drive position. Your PC or laptop must have a DVD Drive or there will be no place to put the SSD and HDD on one laptop/PC.