Very good USB 3.0 dual-drive

I have the record now. A few weeks in operation and I am very satisfied so far The copy my iTunes library that spans multiple terabytes, did the plate in a few hours. Copied files with a size from 1.4 to 6 GB, with an average 190 MB / s and smaller files What I noticed positive, the drive operates under load very quiet!
If the drive is not in use, it runs automatically after a few minutes in a sleep mode or as soon as the drive from the USB port is logged off, thus saving power, because there is no ON / OFF switch on the drive, which is a reason the the installed WD Red hard drives are designed for 24/7 operation in a NAS & this through the on / off switch of the drive to lose life.
Also positive: there are 2 x USB 3.0 ports, so that the drive can simultaneously be used as a USB hub on the drive back.
My conclusion so far, everything is to my satisfaction, therefore 5 star.