Using the USB Removable Capability for Device Container Grouping
The USB Removable capability allows the operating system to create a device container for legacy devices. This mechanism exists to provide backward compatibility for devices that cannot provide a Microsoft OS ContainerID descriptor or for devices integrated with a computer which does not have a USB port capabilities (_UPC) value for the corresponding USB port.
It is important to recognize that the USB hub driver uses available removability information from the physical USB hardware in order to report a more accurate Removable capability for devices connected to each of its internal or external-facing ports. For more information, see Container IDs Generated from the Removable Device Capability.
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