7 RAID Modes for your choice.
RAID 0: Merge all HDD's capacity in the HDD enclosure and upgrade it's performance (reading and writting speed)
RAID 1: Two HDD's in the HDD enclosure can backup each other, cannot upgrade it's performance(reading and writing speed), and it can support self restoration function (RAID 0 and SPAN modes cannot support this function), which makes files can be restored when mistaks and faults occur.
PS: RAID 1 can only support 2 HDDs
RAID 3 and RAID 5 require 3 or more hard drives, one of which will be used for backup data, and the remaining hard drives will be combined for your use.
RAID 3 or RAID 5 not only ensures data security, but also provides certain performance improvements, it's the most economical RAID solution and is suitable for most users
RAID 10 = RAID 0 + RAID 1
Big/JBOD: Merge all HDD's capacity in the HDD enclosure to make it easy to manage but can not upgrade it's performance
Normal : means normal state, all HDDs in the HDD enclosure work independently without forming any RAID modes
Note:
Please backup all files before setting or changing RAID mode
Please don't move HDD when it's in RAID mode.
Please in Normal mode before setting or changing RAID mode
More details please see in User Manual.