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