MyCloud Disk replacements and procedures?

Hi, I have a duo disk MyCloud ( See photos )
I want to replace the disks ?

What type and size hard dives can I use ?

What is the procedure to replace hard drives ?

Hi @alexi7,

For replacement please contact the WD Technical Support team for the best assistance and troubleshooting:

We have been using this for a colossal piece of a time now and it is clearly going charmingly.