Support 4 x 3.5" SATA2/SATA3(6G) and SAS-1/SAS-2(6G) HDD 3.5" or 2.5" HDD can be mounted from bottom of hotswap HDD tray Chassis combines with two intake 80mm fans at front side comes with totally 4 drive bay with the chassis configuration fits all standard MicroATX 9.6"x9.6" motherboard form factor and standard PS2 power supply meets regular server system application