As long as you have enough power, attaching many USB devices to your Microsoft Windows XP system can’t cause degradation in performance — even if you attach as many as 127 USB devices at one time.
While it’s unlikely for that many devices to be connected at a time, that number is made possible by Windows XP’s seven-tiered USB topology. The top, or tier number one, consists of the host controller or root hub, which is the USB hub built into the computer’s motherboard. Tiers two through six are equipped to consist of a series of USB hubs (two or more at each tier) daisy chained together. Tier seven consists of any devices attached to the USB hub(s) at tier six.
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