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