4 bay nas memory capacity 16 tb max hard drives 4 hard drive form factors 25 35 inch hard drive types hdd ssd hard drive mountings screwed removable drive hard drive location horizontal target audience business internal file system ext4 external file systems ext3 ext4 ntfs hfs fat raid levels 0 1 5 6 10 jbod networking gigabit 101001000 connections 2x usb 30 1x esata 4x rj 45 1x rs 232 positions of connectivity ports 2x usb back 4x rj