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While trying to hook up too many USB drives to my Linux machine, I figured the external USB drives may consume too much power.
So how do we find out how much power these devices chew?
Well, using lsusb we can pull a ton of info, including the max power draw of a connected device.
lsusb -v
To minimize the info to just device names and power draw, try this:
lsusb -v |grep '\ Device\ \|MaxPower'
Example output on my QNAP:
Bus 003 Device 002: ID 04e8:61c7 Samsung Electronics Co., Ltd
MaxPower 36mA
Bus 003 Device 004: ID 1058:2667 Western Digital Technologies, Inc.
MaxPower 224mA
Bus 003 Device 003: ID 1058:0748 Western Digital Technologies, Inc.
MaxPower 224mA
Bus 003 Device 005: ID 1058:2667 Western Digital Technologies, Inc.
MaxPower 224mA
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MaxPower 0mA
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MaxPower 0mA
Bus 001 Device 003: ID 1005:b155 Apacer Technology, Inc.
MaxPower 300mA
Bus 001 Device 002: ID 0438:7900 Advanced Micro Devices, Inc.
MaxPower 100mA
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MaxPower 0mA