Danno
28-01-2006, 12:50 PM
USB2 Drivers
USB 2.0 technology and drivers are subject to licensing by Microsoft (and other companies). This licensing means that they can only be distributed with new USB 2.0 devices and controllers, with Microsoft software, by Microsoft via the internet or by manufacturers of the motherboard, USB 2.0 PCI card or device.
If you are having problems a few things to check.
1) check the manufacturer's web site for an update
2) you MUST have Windows Service Pack 1 installed under WinXP for USB 2.0 to function
Without SP1 you would most likely receive error messages such as:
The Generic USB Hub is a HI-SPEED USB device and will function at reduced speed when plugged into a non-HI-SPEED port.
HI-SPEED USB Device Plugged into non-HI-SPEED USB Hub. A HI-SPEED USB device is plugged into a non-HI-SPEED USB hub.
USB hub known issue
If you connect a new USB device to a USB 2.0 hub on a computer, the computer does not detect the USB device. This symptom occurs if the computer is running one of the following operating systems:
Microsoft Windows XP Service Pack 2 (SP2)
Microsoft Windows Server 2003 Service Pack (SP1)
Microsoft Windows Server 2003 x64 versions
Additionally, other USB devices that are already connected to the computer stop functioning, and you have to restart the computer to detect the USB devices. Resolutions to these known Microsoft issues can be found on Microsoft's web site.
http://support.microsoft.com/?kbid=892050
Power drawn and supplied to the hub
Do you have too many devices plugged into the hub? USB devices can draw a maximum of 500 milliamps for each connection. Any more than that and the USB port will be disabled. To find out how much power your devices are using - go into System Properties from Control Panel. Go into Device Manager under Hardware and under the tab for Universal Serial Bus Controllers. Go into USB Root hub and look under power. It will list the mA for devices plugged in. There will be a USB root hub for every two ports you have available. If you do have too many devices plugged in that is trying to draw too much power, simply unplug a device and plug it in only when you want to use it. On the flip side, if a device draws less than 50 milliamps (like a mouse or a pen drive perhaps) the port never becomes active.
Handy Links
USB FAQ: Introductory Level.
http://www.microsoft.com/whdc/system/bu ... intro.mspx (http://www.microsoft.com/whdc/system/bus/USB/USBFAQ_intro.mspx)
Free USB and USB 2.0 Help, Information, Tips, Tricks, Troubleshooting and Forum Board.
http://www.usbman.com/
USB 2.0 technology and drivers are subject to licensing by Microsoft (and other companies). This licensing means that they can only be distributed with new USB 2.0 devices and controllers, with Microsoft software, by Microsoft via the internet or by manufacturers of the motherboard, USB 2.0 PCI card or device.
If you are having problems a few things to check.
1) check the manufacturer's web site for an update
2) you MUST have Windows Service Pack 1 installed under WinXP for USB 2.0 to function
Without SP1 you would most likely receive error messages such as:
The Generic USB Hub is a HI-SPEED USB device and will function at reduced speed when plugged into a non-HI-SPEED port.
HI-SPEED USB Device Plugged into non-HI-SPEED USB Hub. A HI-SPEED USB device is plugged into a non-HI-SPEED USB hub.
USB hub known issue
If you connect a new USB device to a USB 2.0 hub on a computer, the computer does not detect the USB device. This symptom occurs if the computer is running one of the following operating systems:
Microsoft Windows XP Service Pack 2 (SP2)
Microsoft Windows Server 2003 Service Pack (SP1)
Microsoft Windows Server 2003 x64 versions
Additionally, other USB devices that are already connected to the computer stop functioning, and you have to restart the computer to detect the USB devices. Resolutions to these known Microsoft issues can be found on Microsoft's web site.
http://support.microsoft.com/?kbid=892050
Power drawn and supplied to the hub
Do you have too many devices plugged into the hub? USB devices can draw a maximum of 500 milliamps for each connection. Any more than that and the USB port will be disabled. To find out how much power your devices are using - go into System Properties from Control Panel. Go into Device Manager under Hardware and under the tab for Universal Serial Bus Controllers. Go into USB Root hub and look under power. It will list the mA for devices plugged in. There will be a USB root hub for every two ports you have available. If you do have too many devices plugged in that is trying to draw too much power, simply unplug a device and plug it in only when you want to use it. On the flip side, if a device draws less than 50 milliamps (like a mouse or a pen drive perhaps) the port never becomes active.
Handy Links
USB FAQ: Introductory Level.
http://www.microsoft.com/whdc/system/bu ... intro.mspx (http://www.microsoft.com/whdc/system/bus/USB/USBFAQ_intro.mspx)
Free USB and USB 2.0 Help, Information, Tips, Tricks, Troubleshooting and Forum Board.
http://www.usbman.com/