So I have recently purchased an Airport extreme and all is well with my network. This morning I attached a small USB HD to learn how to use this as network attached storage. It is working, but it will not auto-mount. Per the Apple KB-there should be a setting in the disks section of the Airport Utility to automatically mount hard drives. It is not there. I can access the drive by using the finder>go>network option which is fine for me, but would be too difficult for other members of the family. What am I doing wrong here? Thanks!