The Removable 4drive Backplane makes inserting and removing drives fast and easy, by turning three 5.25 bays into a hotswappable interface for up to four 3.5rdquo 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 keylock design. To help prevent drive failure, the bay provides drive cooling with a builtin fan and excellent heat dissipation with a vented aluminum enclosure. Features. Solid aluminum construction. Key lock design. Builtin fan. 4 drive bay design. Installs in three 5.25 drive bays. Trayless design for easier hot swapping. Support for SATA revision I/II/III 1.5/3.0/6.0 Gbps. Support for SAS revision I/II 3.0/6.0 Gbps. Power and Activity LEDs for each drive. UL94 V0 flammability rating. 4Bay Trayless HS Mobile Rack Backplane f3.5 SAS SATASpecifications. Compatible Drive Types Type and Rate SAS SATA. Drive Installation Removable. Drive Size 3.5 in.. Fan Bearing Type Sleeve Bearing. Fans Yes. Fans 1 70 mm. Interface SATA. Key Lock Yes. Number of Drives 4. Number of internal 3.5 inch bays 4. Max Drive Capacity Currently tested with up to 6TB 7200 RPM hard drives. Maximum Data Transfer Rate 6 Gbit/s. Drive Connectors 4 SFF8482 29 pin, Data Power, Internal SAS Receptacle. Host Connectors 2 SATA Power 15 pin Receptacle. OS Compatibility OS independent No soft.ware or drivers required. System and Cable Requirements Flammability rating UL94 V0. LED Indicators 1 Power LED. Weight 2.78 lbs