smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.10.0-26-generic] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org ERROR: smartctl takes ONE device name as the final command-line argument. You have provided 2 device names: /dev/sda /dev/sda1 Use smartctl -h to get a usage summary