PolicyKit, keeping you in check
On my default KDE 4.1.x ( unstable ) install, mounting DVDs or CDs has never worked. Tonight i decided to find out why. The problem that occurs is that when i insert a DVD, CD or any other removable media, i can't access it ( without doing an old school mount from command line ). When i click on the media in Dolphin, i get and error along the lines of "org.freedesktop.hal.storage.mount-removable no <-- (action, result)". Turns out this is a PolicyKit issue, so i decided to actually find out more...
What was always my understanding of how Linux systems allow users to access certain devices/services, was by pushing users into a group containing those services. I might be way behind the times on this, since i am an openSUSE user, and the PolicyKit page maintains that Debian systems rely on group membership, while RedHat systems provide a mechanism where a local user can enter a root password to access these services.
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