I·ve pulled out all the disks inside the RAID System and now I want to put them back, but I don·t remember the HDD allocation. Will my data be safe if I put the HDDs back into the RAID System if they·re not in the correct allocation?

No, it would NOT be safe for your data if the HDDs were not placed back into the RAID System in their original arrangement order. We would highly recommend all users to use the number stickers in the package to help identify which HDD belongs to which HDD slot. You may stick them onto the handles or HDDs as identification.