smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-85-generic] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org /dev/sdd: Unknown USB bridge [0x8564:0x4000 (0x037)] Please specify device type with the -d option. Use smartctl -h to get a usage summary