Microsoft KB Archive/908673

= Problems may occur when you try to transfer files to or from a device that is connected to a USB 2.0 hub in Microsoft Windows XP =

Article ID: 908673

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

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SYMPTOMS
You may experience one or more of the following symptoms when you try to transfer files to or from a device that is connected to a universal serial bus (USB) 2.0 hub in Microsoft Windows XP:
 * When you try to transfer files, the file transfer fails. You may receive an error message about a delayed write failure. The error message that you receive may vary, depending on the device that you are using.
 * Other USB devices that are connected to the USB 2.0 hub may stop working. You may receive notification that the USB devices have been disconnected or reconnected.
 * Power may be disabled on USB devices. Then, the devices are reenumerated.
 * A USB keyboard may stop working correctly. For example, the behavior of keys may be irregular. When you press a key, the key entry may be repeated many times. Alternatively, when you press a key, nothing may occur at all.

Note Some computers have an internal USB 2.0 hub. For example, a portable computer may have a single USB bus and may use an internal USB hub to provide two or more available USB ports on the computer. Therefore, this issue may occur if the device is connected directly to a USB port on the computer. This issue may also occur if the device is internal and is connected internally to the internal USB 2.0 hub. For example, this problem might occur if you use a portable computer that has an internal Bluetooth radio that is connected to an internal USB 2.0 hub. When you use this Bluetooth device to transfer the files to another device, you may experience the symptoms that are described in the &quot;Symptoms&quot; section.



CAUSE
This problem may occur when there is lots of traffic on the USB 2.0 hub, and you transfer files to a low-speed or a full-speed USB device. The problem does not occur when you transfer files to a high-speed USB device.

For more information about USB 2.0 data transfer rates, see the &quot;More Information&quot; section.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



Data transfer rates that USB 2.0 supports
USB 2.0 supports the following maximum data transfer rates, depending on the amount of bus bandwidth that a device requires:
 * 1.5 megabits per second (Mbps) for low-speed devices that do not require lots of bandwidth. These devices include mouse devices and keyboards.
 * 12 Mbps for full-speed, higher-performing devices. These devices include storage devices, speakers, scanners, and video cameras.
 * 480 Mbps for high-speed devices. These devices include mass storage devices and Hi-Speed CD or DVD recorders.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: &quot;Low-Speed&quot; &quot;Full-Speed&quot; &quot;High-Speed&quot;

Keywords: kbexpertisebeginner kbqfe kbhotfixserver KB908673

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