The HSB4SATSASBA Removable 4-drive Backplane makes inserting and removing drives fast and easy, by turning three 5. 25" bays into a hot-swappable interface for up to four 3. 5"" SATA or SAS hard drives (HDD) . For added versatility, the hot swap bay can interface with SATA I/II/III and SAS I/II hard drives - an ideal solution for enterprise system applications. For a quick and secure method of installing and removing drives, the backplane features ejection levers and a key-lock design. To help prevent drive failure, the bay provides drive cooling with a built-in fan and excellent heat dissipation with a vented aluminium enclosure. The HSB4SATSASBA is backed by a StarTech. com 2-year warranty and free lifetime technical support.