Yep, another copy/paste, from Ubuntu forums ():
I am not sure how to activate a usb device in Edgy, but I can tell you how I did it in Feisty.
First, it had nothing to do with fstab.
This solution worked for me :
Edit (as root) /etc/udev/rules.d/40-permissions.rules (I use vim, you can use nano, getid, or whatever)
Change this line :
For further advice see : http://www.virtualbox.org/download/UserManual.pdf
See section 10 "Troubleshooting" there is a section on USB devices.