In this guide, I will disassemble an Alienware 17 R4. I will remove the bottom cover to upgrade the SSD, HDD, and RAM.
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There are two different types of screws, and I circled them with different colors.
Remove six screws (red) that securing the bottom cover to the laptop.
Loosen one screw (yellow). Insert a pick to pry up the bottom cover.
Under the bottom cover, you can get access to three M.2 SSD slots, two RAM slots, and a hard drive module.
From the picture you can see, Alienware 17 R4 comes with two M.2 2280 SSD slots (support SATA and PCIe SSD) and an M.2 2242 slot.