Sorry for my too few words been posted in 1st messages.
I installed FreeBSD 7.1-release on atom 330 intel 945 motherboard and the usb scanner is Microtek scanmake 3830.
When I use sane-backends-1.0.19_1, which is current in 7.1 release, The error message is:
Failed to open device `sm3830:libusb:/dev/usb0:/dev/ugen0':
Access to resource has been denied.
But if I pkg_add sane-backends-1.0.18.tgz. The scanner will be opened and can be accessed.