WD My Cloud Mirror, 4Тб wdbzvm0040jwt-eesn

Question by this device (WD My Cloud Mirror, 4TB [wdbzvm0040jwt-eesn)

It has two hard drives to two terabytes in RAID0 or two hard disk drive to 4 terabytes in RAID1?

Neither. It’s 4TB in RAID0 or 2TB in RAID1.

Why is it on various websites on the Internet a variety of information, is not it possible manufacturer is difficult to give this NAS two disk 4TB * or 2 * 2 TB

It is possible. The 4TB version is 2x2TB. The 8TB version is 2x4TB.