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Workaround #1 - Configure the Host Controller to Use the FirePRO Driver To determine the speeds (e.g., S400/S800) required to operate at various frame rates, please consult the Isochronous Bandwidth Requirements section of the Register Reference for Digital Cameras. However, devices running at S800 speeds (such as Dragonfly EXPRESS at 120 Hz) do not operate correctly using this Hotfix. It is important to note that initial test results show that devices running at S400 speeds (400 Mbps) operate correctly using the Hotfix. The following Microsoft knowledge base article explains the problem for Windows XP Service Pack 2 users, and provides a Hotfix designed to enable devices that run at S400 speeds to operate correctly. Windows XP Service Pack 2 and Service Pack 3 incorrectly force S800 (1394b) and S400 (1394a) nodes to S100 speeds while Windows Vista forces S800 (1394b) nodes to S400 speeds. The problem occurs if you connect a 1394a or 1394b FireWire device to a 1394b bus, or a 1394b device to a 1394a bus. The following article describes this issue in more detail and provides information on possible solutions.
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FireWire cameras used with Windows7 and newer operating systems do not experience this decreased performance.
DRIVER CACHE I386 WINDOWS XP UPDATE
Performance of 1394 devices may decrease after installing Windows Vista or Windows XP SP2 or SP3Īfter you update your computer to Microsoft Windows XP Service Pack 2 (SP2), XP Service Pack 3 (SP3), or Vista, the performance of your 1394a or 1394b FireWire devices may be greatly decreased if your host controller was not previously configured to use the FirePRO driver.