I read this link
http://www.freebsd.org/gnome/docs/halfaq.html
when plug USB storage ,it mount automatic and I can see content of USB storage and use it .
but when I right click of my USB storage and use unmount option , USB storage unmount for second and mount automatic again and I can unmount it .
and I have shutdown system and unplug USB storage and ON system again.
http://www.freebsd.org/gnome/docs/halfaq.html
when plug USB storage ,it mount automatic and I can see content of USB storage and use it .
but when I right click of my USB storage and use unmount option , USB storage unmount for second and mount automatic again and I can unmount it .
and I have shutdown system and unplug USB storage and ON system again.