4 bay nas memory capacity 16 tb number of installed hard drives 4 max hard drives 4 memory capacity per hard drive 4 tb hard drive types hdd ssd target audience small and medium sized businesses smbs internal file system btrfs external file systems ext3 ext4 ntfs fat32 hfs raid levels 0 1 5 6 10 jbod single disk networking gigabit 101001000 connections 1x usb 20 2x usb 30 2x esata 2x rj 45 cases 1u rack mount optical disc drives withou