Extension of Additional Drive on NAS214

[paddybapat]

Hi I Nas Storage device which i currently using. I am unable or rather scared to do some actions in the system. 

Problem: 

I have installed NAS 214 and has a 10 TB storage drive. And for some additional work i want to extend the drive by installing additional drive in it of 10 TB. 

I dont know what steps to follow. If some one can help that would be great. 

Attached is the Storage drive snapshot.

[StephenB]

Is your goal increasing storage?

Or do you want to use RAID-1, which won't increase storage but will provide some protection against routine disk failures?