sudo smartctl -i /dev/sdb smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.5.0-2-amd64] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org /dev/sdb: Unknown USB bridge [0x0bc2:0x3322 (0x100)] Please specify device type with the -d option. Use smartctl -h to get a usage summary