3 bay aluminum trayless hot swap mobile rack backplane for 35in sas iisata iii 6 gbps hdd easily connect and hot swap up to three 35rdquo satasas hard drives from two 525rdquo bays solid aluminum construction key lock design built in fan 3 drive bay design the hsb3satsasba removable 3 drive backplane lets you quickly install and hot swap 35 drives from the front of your computer by turning two 525 bays into a hot swappable interface for you to connect up to three 35rdquo sata