1. Check USB device
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pi@raspberrypi:~ $ lsusb Bus 002 Device 004: ID 152d:0561 JMicron Technology Corp. / JMicron USA Technology Corp. JMS551 - Sharkoon SATA QuickPort Duo Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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The first line indicates that the USB device has been correctly recognized by the OS.