Alienware 15 R3 SSD 3 seems to be extremely hard to remove, don't know why this came installed when I bought it it also has windows on it but that shouldn't matter. :
Alienware 15 R3 - i7-7700HQ · NVIDIA GeForce GTX 1070 (8GB GDDR5) · 15.6”, Full HD (1920 x 1080), IPS · 512GB SSD · 1TB HDD · 32GB DDR4, 2400 MHz · Windows 10 Home | LaptopMedia.com