4 bay nas nas enclosure max hard drives 4 hard drive form factors 25 35 inch hard drive types hdd ssd hard drive access front hard drive location horizontal internal interface sata iii target audience small and medium sized businesses smbs internal file system ext4 external file systems ext3 ext4 ntfs fat32 hfs raid levels 0 1 5 6 10 5 networking gigabit 101001000 connections 2x rj 45 4x usb 30 1x usb 20 1x hdmi positions of connecti