How to change permission external hard drive in ubuntu 12.04

Solution 1:

Also try this Open nautilus file manager as root by typing following command in terminal

sudo -i

Now enter your password

Now open nautilus file manager by typing nautilts in the terminal

Now find your external hard disk on nautilus file manager and open properties of your external hard disk.

Now click permissions tab and change file access to read write.

Try this:

mount -o rw,remount /dev/<devicename> /path/of/device/mount/directory

Example:

mount -o rw,remount /dev/sdb1 /media