# smartctl -q noserial -x /dev/sdb smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.14.0-2-amd64] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org /dev/sdb: Unknown USB bridge [0x152d:0x578e (0x1402)] Please specify device type with the -d option. Use smartctl -h to get a usage summary