Where in "/" should extra permanent disks be mounted?

According to Wikipedia http://en.wikipedia.org/wiki/Unix_directory_structure http://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard extra disks should not be mounted in /mnt/ according to the first link, but doesn't seams so according to the second link. Both say thought that they shouldn't be in /media. **Question** So where should extra permanent disks be mounted?