there is a file in the /etc (configuration) folder. it is used to store information about your 'file system table'. its full path is '/etc/fstab'. open a terminal window and login as root and edit that file, for example type the following at the prompt to do this:
sudo gedit /etc/fstab
it will ask for the root password for the sudo (super-user do) command, so make sure you have that and enter it in when asked. this will then open the program 'gedit' (similar to M$'s wordPad) and load the file /etc/fstab. add a line to the end of this file to have a location auto-mounted on bootup.
here is an example of a line i added to have one of my NTFS partitions auto-mounted on boot:
/dev/hdb5 /mnt/win3 ntfs auto,users,umask=000,rw 0 0
you can use that just replacing the 2 paths, if you like.
edit: also, be sure to watch your spelling of the paths you enter in, linux is case sensitive. /Dev is not /dev.