2010-10-03, 09:22 PM
The partition has to be unmounted (i.e., unloaded/inactive). Maybe right click the partition(?) in gparted to bring up a menu or check Device/Partition in the Toolbar.
Or just simply run from a terminal/command-line:
>> sudo umount /dev/sdb5
Or just simply run from a terminal/command-line:
>> sudo umount /dev/sdb5

