Help with HDD from Drobo 2nd Gen

Hi all. I have a Drobo 2nd Gen in which I used two hard drives. Then I replaced those hard disks with other ones. Many years later, I got the two hard drives that I used in the Drobo and wanted to use them in a mobile-rack in Windows 11. So these two hard drives don’t show up in Windows 11. No hard drive program can see them. The mobile-rack is installed inside the PC case: power and SATA are there. It’s supposed to see any hard drive. Question: maybe the two hard drives from Drobo are cleverly formatted by Drobo itself and are not visible in Windows? What should I do?
P.S. The mobile-rack already used 400 GB and 1TB hard drives. Two drives from Drobo: 1.5TB and 2TB