ICY DOCK Tool-less 3.5" SATA III HDD USB 3.0 External RAID Drive Enclosure - ICYRaid Dual Bay MB662U3-2S R1 Built-in hardware RAID controller allows four different configurations: RAID 0 (FAST), RAID 1 (SAFE), JBOD, & BIG. Tool-Less design for easy hard drive upgrade or replacement. Supports 2 x 3.5 SATA I / II / III hard drives. Supports the latest 8TB HDD per bay in all 4 RAID modes for up to 16TB of storage. Solid aluminum body construction for portability, heat dissipation and extra protection.