Backplane for 4x 2 5 sas or sata hdd in 1x 5 25 bay 2x host connector dual channel for each hdd hard disk capacity not limited support hdd height 9 5 15 mm sata host interface 3 0 gbits hdd tray with key lock led for power hdd accesshdd failure 2x 40x40x10 mm cooling fan plug play and hot swap supports all operating systems