The Promise Super Swap 4600 is a 4-bay, internal hot-swappable drive enclosure designed for desktop & tower servers. The drive enclosure supports SAS/SATA data transfer rates of up to 3 Gb/s & is also backwards compatible with SATA/SATA II 1.5 Gb/s disk drives. In addition to 3.5" disk drives, Super Swap 4600 also supports 2.5" form factor thereby giving customers the ultimate storage enclosure designed for their needs.