Hi [NAME] welcome to this free user to user Alienware laptop discussion forum. This is not Dell Support.  Alienware x17 R1 internal drives are M.2 up to PCIe Gen4 x4 NVMe cards. There is no compatibility with older internal Solid State Drives. There is always the option to have older external drives.  [This user does not work for Dell and volunteers their free time. Please remember to say thank you by clicking on Kudos as this user's only reward.] 
Hi guys,  I just upgraded from an Alienware 17 R2 to a new x17 R1 and was trying to swap my old m.2 2280 NGFF SSD's into the new system but when I switch on the laptop I cannot find the drive when it was installed correctly. I cant even find it on the disk management. I have browsed the BIOS and cant see an issue there either. I did not change any setting from stock as a matter of interest so I may have missed it entirely. Is this new x17 just not compatible with the older SSD's?  Any advice or guidance would be greatly appreciated. Many thanks.
x17 R1, SSD NGFF compatibility