I bought two copies in December (excellent reliability to date), but the discs do not put on standby, as his little brother 1 TO. The third copy purchased recently goes to sleep, he, and even faster than the 1TB model. This disk is very quiet, but why run continuously? Now it is extremely quiet when running, but it also stops very quickly as soon as it is no longer actuated. This disk 2TB has become perfect. (Kudos to Amazon, again, for the speed of delivery)