Western Digital WD30EFRX Red 3TB internal hard drive for NAS storage (8.9 cm (3.5 inches), 5400rpm, SATA III) (Personal Computers)
Maybe I'm too sensitive, but I can hear the drive even when the Synology, in which it is installed, is stored in a closet. You easily but is otherwise, and is obviously also save enough electricity - always remains below 35 ° C, even when I'm stresse