4 bay nas max hard drives 4 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 without protocols cifssmb afp nfs http https ftp ftps ssh sftp webdav iscsi hdd managements