I found a bug in the GetLastError() call I was making after all calls to DeviceIOControl() when accessing the devices mounted by Windows. This has been corrected and posted to http://starship.python.net/crew/samschul/ These changes have been made to SCSITOOLS23USBVer1.4.zip, and SCSITOOLS24USBV1.4.zip
Sam Schulenburg -- http://mail.python.org/mailman/listinfo/python-list