I already have the following storage configuration in my Area 51M R2:

• 1 TB ( 2 x 512 MB m.2 raid 0) 
• 1 x 512 MB m.2 
• 1 x 512 MB m.2 

Can I still replace 1 of the M.2 slots with single 1 TB m.2 drive?

 

I see in the documentation that the max is 2TB but it doesn't say if it's the total for all slots  or per slot.

 

https://dl.dell.com/topicspdf/alienware-area51m-r2-laptop_users-guide_en-us.pdf