Thanks for your feedback, but it didn't work for this issue.
I doubt it's related nautilus, when I click the eject icon in nautilus to umount the sdcard, the item of sdcard is still there, as "4.0 GB Volume", and the sdcard was removed successfuly from kernel's log.
So if click the eject icon again, it will show an error "Unable to eject 4.0 GB Volume", "Error ejecting /dev/mmcblk0: Command-line 'eject /dev/mmcblk0' exited with non-zero..".
@daniel,
Thanks for your feedback, but it didn't work for this issue.
I doubt it's related nautilus, when I click the eject icon in nautilus to umount the sdcard, the item of sdcard is still there, as "4.0 GB Volume", and the sdcard was removed successfuly from kernel's log.
So if click the eject icon again, it will show an error "Unable to eject 4.0 GB Volume", "Error ejecting /dev/mmcblk0: Command-line 'eject /dev/mmcblk0' exited with non-zero..".