Connect and hot swap four 3.5in SATA III or SAS II hard drives to your computer system in three 5.25\" bays, with support for transfer speeds up to 6 Gbps. 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 aluminum enclosure.