Microsoft KB Archive/315912

= USB Bulk Transfer May Not Work with an Acer Laboratories Inc. USB Controller =

PSS ID Number: 315912

Article Last Modified on 5/20/2003

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The information in this article applies to:


 * Microsoft Windows 2000 Professional SP1
 * Microsoft Windows 2000 Professional SP2
 * Microsoft Windows Millennium Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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This article was previously published under Q315912



SYMPTOMS
When you are making a bulk transfer to or from a Universal Serial Bus (USB) device that is connected to a computer with an Acer Laboratories Inc. USB host controller, the transfer may not work. This problem may be more likely to occur if the USB device is connected by using a USB hub, instead of being connected directly to a USB port (part of the USB root hub) that is built into the computer.

For example, if you attempt to scan an image from a USB scanner, you may be unable to view a preview image, or you may receive an &quot;An error occurred during picture transfer&quot; error message when you attempt to scan an image. Other examples of bulk USB transfers include reading from or writing to USB disk devices (such as floppy, CD-ROM, or Zip drives), USB tape devices, USB network devices, or USB printers.



CAUSE
This problem may occur on some computers that use an Acer Laboratories Inc. south bridge chip set with an Acer Laboratories Inc. M5237 Open Host Controller Interface (OHCI) USB controller. This problem is caused by an interaction between the Acer Laboratories Inc. USB chip set and certain motherboard design elements. Under certain PCI bus signaling conditions, the Acer Laboratories Inc. USB controller may produce damaged USB packets that could be misinterpreted by USB devices as different packet types. This behavior is dependent on motherboard design, and because of this, does not occur on all computers that use Acer Laboratories Inc. USB controllers.



MORE INFORMATION
For more information about Acer Laboratories Inc., please view the following Acer Laboratories Inc. Web site:

http://www.ali.com.tw

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Additional query words: ali

Keywords: kberrmsg kbprb KB315912

Technology: kbwin2000Pro kbwin2000ProSearch kbWin2000ProSP1 kbWin2000ProSP2 kbwin2000Search kbWinME kbWinMEsearch kbWinXPHome kbWinXPHomeSearch kbWinXPPro kbWinXPProSearch kbWinXPSearch

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