Can I use a different Hard disk?

Hello, I have 4Bay NAS EX4, and My book live duo . Inside of my ex4 I have 4 WD Red colour hard disk and 2 Green colour hard disk in my book live duo. My question is can I swap my two green hard disk to Ex4 and take two red colour hard disk and put in my book live duo , is it possible ?


Which RAID configuration are you using on your My Cloud EX4 and what are you trying to accomplish by changing the hard drives?