Feature: 1. 4 Modes: This RAID hard drive enclosure is designed with 4 modes, including RAID 0 mode, RAID 1 mode, LARGE mode and PM mode, meeting your different needs. 2. RAID 0 Mode: The RAID 0 mode of this external hard drive case is suitable for the fields that require high speed but not high safety, which ensures smoothing data reading and writing. 3. RAID 1 Mode: The RAID 1 mode of this external hard drive enclosure is perfect for ensuring data safety. Two HDD's in the HDD enclosure can backup each other, and it can support self restoration function, which makes files can be restored when mistakes and faults occur. 4. LARGE Mode: The LARGE mode of this NVMe RAID hard drive enclosure aims to merge all HDD's capacity in the HDD enclosure to make it easy to manage but can not upgrade it's performance. 5. PM Mode: The PM mode of this external hard drive RAID enclosure indicates isolated storage, suitable for retaining the original data on the hard disk. Hard disks do not affect each other. If one hard disk is damaged, the other hard disks still work normally. Specification: Item Type: RAID Hard Drive Enclosure Material: Aluminium Alloy Support: Dual Bay NVMe RAID Modes: 4 Transmission Rate: 20Gbps. Package List: 1 x RAID Hard Drive Enclosure1 x Screwdriver20 x Silicon Pads1 x USB to Type C Cable1 x Dual Type C Cable