Avoid Underpowering Your USB Devices

摘要

IF YOUR PC'S USB portsare filled up with USB hubsthat are packed with yet moreUSB devices, make sure thatall of those gadgets are get-ting the power they need torun properly. A single USBroot hub, which typicallysupports two USB ports onyour PC's motherboard, de-livers a maximum of 500 mil-liamps of electricity to its at-tached devices. If the powerdemands of your system'sconnected USB devices ex-ceed that number, the wholeUSB bus can shut down.