My Cloud EX2 Ultra Purchase

Hi everyone! I’m interested to buy this NAS My Cloud EX2 Ultra:

When I select the capacity in that page, means the complexive capacity that is disk 1 + disk 2 OR means half capacity caused by RAID 1?

I mean:
Capacity 4TB = 2TB + 2TB
OR
Capacity 4TB = 4TB + 4TB

Thank you so much!

The advertised capacity is TOTAL RAW capacity. Meaning an 8TB system consists of 2 4TB drives.
RAID0 would give you a tad less than 8TB usable, and RAID1 would give you a tad less than 4TB.