I was under the impression that all 2.5 inch drives fit I'm laptop. I bought this for 4tb drive for my area 51m r2 but looks to have a different connector and
How to install RAM and an SSD - Alienware Area51m - YouTube
Alienware Area-51m R2 Service Manual
Amazon.com: Deal4GO SATA Hard Drive Cable 2K51N 02K51N w/ 2.5" HDD Caddy Carrier 0J8J5W J8J5W Replacement for Dell Alienware Area 51M ALWA51M : Electronics