4 bay nas memory capacity 16 tb number of installed hard drives 4 max hard drives 4 memory capacity per hard drive 4 tb target audience small and medium sized businesses smbs raid levels 0 1 5 10 networking gigabit 101001000 connections 2x usb 30 2x rj 45 case tower optical disc drives without hdd management hot swap server service web server dimensions hxwxd 240 x 247 x 377 mm weight 66 kg