My Book Studio Edition II ( Raid )

I’m currently using My Book  Studio Edition II (Raid+1).

I only can see 1 partition right?

Let say if my drive damaged, how I restore back my hard disk?

I don’t know much about RAID but RAID 1 should have a mirror image on second drive. RAID 0 would have double the capacity but the data will be on both drives. With RAID 0 if one drive goes bad you’re screwed. That’s about all I can offer.