Article ID: 940021 - Last Review: July 12, 2007 - Revision: 1.1

The data transfer speed of a USB 1.x device may be slower than expected when you connect it to a USB 2.0 hub on a Windows XP SP2-based computer

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SYMPTOMS

When you connect a USB 1.x device to a USB 2.0 hub on a Microsoft Windows XP Service Pack 2 (SP2)-based computer, the data transfer speed of the USB 1.x device may be slower than expected.

Note This problem may also occur on a Windows XP Service Pack 1 (SP1)-based computer after you install the hotfix that is described in the following Microsoft Knowledge Base article:
810090  (http://support.microsoft.com/kb/810090/ ) Universal serial bus devices may not always be detected when you start or resume the computer in Windows 2000 or in Windows XP
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CAUSE

This problem occurs because of a change in the way that Windows XP handles certain types of data transfers, as described in Microsoft Knowledge Base article 810090.
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WORKAROUND

To work around this problem, connect the USB 1.x device directly to the root universal serial bus (USB) port on the computer.
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STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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APPLIES TO
  • Microsoft Windows XP Service Pack 2, when used with:
    • Microsoft Windows XP Professional
    • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Service Pack 1, when used with:
    • Microsoft Windows XP Professional
    • Microsoft Windows XP Home Edition
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Keywords: 
kbexpertiseinter kbtshoot kbprb KB940021
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