Same problem here, after upgrade from Lucid to Maverick. Thumb drives and USB external DVD drive remount automatically when I right-click and 'Safely Remove Drive'. Works on second attempt and works first time when unmounted from the command-line.
$ lspci | grep USB
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)
Same problem here, after upgrade from Lucid to Maverick. Thumb drives and USB external DVD drive remount automatically when I right-click and 'Safely Remove Drive'. Works on second attempt and works first time when unmounted from the command-line.
$ lspci | grep USB
00:02.0 USB Controller: nVidia Corporation CK804 USB Controller (rev a2)
00:02.1 USB Controller: nVidia Corporation CK804 USB Controller (rev a3)