I happened to buy the NAS 4TB. It looked awesome, but it turned out to be very unreliable. Lost a lot of very important files because the system became unreliable and impossible to fix, even customer service could not do it after an entire year of back and forth troubleshooting. The customer support's response is quick, but no solution just "Thank you for contacting us". You will be asked the same questions over and over again and suggests the same fix over and over again. An indication that they do not read prior posts. Also, you only get one response a day, if that. The system is very slow - trust me on this. Imagine uploading 1 music file in 20 minutes (5.4mb). I cannot trust every product with this label. Not a total loss, you can use it as an external drive, but for the price you can have 5 times the storage capacity. Also, 4TB equals 3.6TB of available space for this product. Instead buy the reliable names like WD and Seagate. What I learned - looks are deceiving.