BPU-2535 internal drive cage is a compact and cost effective solution for an internal 3.5" drive cage with two 2.5" drive bays. It provides an extra storage within a compact design to satisfy many application needs. BPU-2535 is constructed of aluminum material that provides best heat dissipation required for high performance 2.5" laptop SATA drives. With mirroring technique (RAID 1), BPU-2535 is able to maintain data in two disk drives simultaneously, which provides extra protection on critical data backup.