Data Storage - external box for 2 x 3.5" SATA HDD / SSD, RAID 0, 1, Single, Large, USB 3.0 The specialty of the Icy Box IB-RD3621U3 is to create a RAID disk array of 2 SATA drives of your choice. Choose the Single, LARGE, RAID 0, and RAID 1 configurations to accommodate the emphasis on speed and maximum reliability with mirror backup or if you require one large storage space. The external box with a modern USB 3.0 interface with a transfer rate of up to 5GB/sec ensure a fast rate of transmission. The 6cm fan provides enough cold air to ensure a long life for the disks even at full load.Key Features of the Icy Box IB-RD3621U3RAID system for 2 SATA 3.5"Unlimited disk capacityQuiet cooling operation (6cm fan)Hot SwapTransmission speed up to 5GB/sec via USB 3.0