Can't get two hard drives to work

I have a couple of 1tb hard drives that i want to sell, but I can't get them to show up in windows. I just want to confirm they work and format them.

When i used them i had them inside a NAS box with RAID 1, and i am convinced they are not broken as i have taken care of them.

Could the raid be the reason they don't show in windows?

Thanks.