ubuntu mount the usb driver
from http://wiki.ubuntu.org.cn/UbuntuHelp:Mount/USB
Mount the Drive
We can now mount the drive. Let's say the device is /dev/sdb1, the filesystem is FAT16 or FAT32 (like it is for most USB flash drives), and we want to mount it at /media/external (having already created the mount point):
sudo mount -t vfat /dev/sdb1 /media/external -o uid=1000,gid=100,utf8,dmask=027,fmask=137
The options following the "-o" allow your user to have ownership of the drive, and the masks allow for extra security for file system permissions. If you don't use those extra options you may not be able to read and write the drive with your regular username. Otherwise if the device is formatted with NTFS, run:
sudo mount -t ntfs-3g /dev/sdb1 /media/external
You must have the ntfs-3g driver installed. See MountingWindowsPartitions for more information.
[编辑] Unmounting the Drive
When you are finished with the device, don't forget to unmount the drive before disconnecting it. Assuming /dev/sdb1 mounted at /media/external, you can either unmount using the device or the mount point:
sudo umount /dev/sdb1
or:
sudo umount /media/external
You cannot unmount from the desktop by right clicking the icon if the drive was manually mounted.