If the client computers run Windows 2000, you have to use this option. This article has a script for this: http://badzmanaois.blogspot.com/2008/09/disable-usb-storage-using-vbs-script_07.html
2. Using Group Policy as described in the KB article at http://support.microsoft.com/kb/555324
1. Computer Configuration-->Policies-->Administrative Templates-->System-->Removable Storage Access
2. User Configuration-->Policies-->Administrative Templates-->System-->Removable Storage Access
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Yagmoth555 edited Revision 11. Comment: great article!, adding a fr-FR link
Ed Price - MSFT edited Revision 10. Comment: TOC, tags
Ed Price MSFT edited Revision 5. Comment: Updated font to Segoe UI, size 12.
Ed Price MSFT edited Revision 4. Comment: Updated title per style standards.