![]() 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. Note Some computers have an internal USB 2.0 hub. Alternatively, when you press a key, nothing may occur at all. When you press a key, the key entry may be repeated many times. For example, the behavior of keys may be irregular. Then, the devices are reenumerated.Ī USB keyboard may stop working correctly. You may receive notification that the USB devices have been disconnected or reconnected. Other USB devices that are connected to the USB 2.0 hub may stop working. The error message that you receive may vary, depending on the device that you are using. You may receive an error message about a delayed write failure. When you try to transfer files, the file transfer fails. When you do this, you may experience one or more of the following symptoms: You try to transfer files to or from a device that is connected to a universal serial bus (USB) 2.0 hub in Windows XP, in Windows Vista, or in Windows 7. For more information, refer to this Microsoft web page: Support is ending for some versions of Windows. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011. ![]()
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