Eject all removable media at logout
User Configuration > Policies > Centrify Settings > Mac OS X Settings > Media Access Settings > Eject all removable media at logout
Control whether removable media, such as CDs, DVDs, Zip disks, or FireWire drives, are automatically ejected when users log out. If you enable this group policy, CDs, DVDs, and other disk media are automatically ejected when users log out to ensure removable media is properly disconnected and put away when users end their sessions.
Once this group policy is enabled, it takes effect when users log out and log back in.