Unfortunately i bought TS-453A 4 discs to replace the S 2 discs. I am completely dissatisfied with the software. Most are non-utility software for those many songs, photos or movies. Many Software too are BETA version. The NAS does not go into hibernation for inactivity. S falls sleep and wakes up smartly, QNAP has to give the order to go into spleep mode and i need use the MAGIC Socket to wake up remotely. The android software to access the NAS also is nothing useful, and almost impossible to select music, photos or movies. More than 550 € for i have only disks with RAID 1 !!!! very very expensive I strongly advise against buying. 
