You can check the USB port and USB power used by your device by checking the System Information. With a USB 3 cable, your USB 3.0 device can use up to 900mA of power, but if it is connected to a USB 2 port, it will only get 500mA of power. USB 3 ports can provide up to 900mA of power while the maximum power given by a USB 2 port is 500mA. Make sure the USB accessories connected to your Mac have been charged already or use them as self-powered devices instead of being powered by your Mac. Thus one possible solution is to reduce the amount of bus-powered devices connected to your Mac. In this case, your Mac is connected to one or more bus-powered devices that are taking too much power from your Mac. Reduce bus-powered devices connected to your Macīus-powered devices refer to devices that get power from the device that they are plugged into.
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