ASUSTOR succeeded with his AS-6-series is a good introduction to the NAS area. The AS-604T proves performance system with a good functionality. The unit is well made and comes with a useful built-management software. The sleep mode "system sleep mode" (S3) just like. Even if the drives go into sleep mode, they are ready fairly quickly.Besides a large interface fundus provides the NAS server online capacity expansion and a RAID level migration.