I can't see my disk

I converted from RAID 0 to RAID 1 and it tooks about 8hr and I always monitored the situation. But at 97% i closed browser windows to have shower and now if i try to contact disk with I can’t access because page goes on loading loop. Also WD Quick View can’t see the disk. And now? I can’t see if conversion process has finished and I don’t understand what can I do… Help please :frowning:

Try to powercycle the my book, also check what color is the front light.