What is USB legacy support and what does it allow?
USB legacy support allows the use of a USB keyboard, mouse, or hub connected to a USB port during startup or in an MS-DOS-based program or utility. It also permits starting or restarting from an optional external MultiBay or an optional USB bootable device. USB legacy support is enabled by default at the factory. (Page 7)
From the official HP Usb Hubs manual, page 7
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