USB-mount versus XBMC library

[HerrMannelig]

Hi,
I have a annoying problem with my Pi.

I use an external hard disk drive which contains movies and music. The drive is scannend by XBMC to create a library.

Now the problem: Everytime I restart the Pi or the drive, the address where the drive is mounted changes (usb, usb0 or usb1) and because of this, the library doesn't work anymore.

I'm a linux newbie and have no clue how to fix this problem.