Network attached storage expansion max hard drives 12 hard drive form factors 25 35 inch hard drive types hdd ssd hard drive access front hard drive location horizontal internal interfaces sata iii sas 20 target audience business cases rack mount 2u display status without special feature redundant power supply nas cooling system fan number of fans 3 fan size 60 power consumption in use 16247 watt allowed temperature in use 0 40 permitted h