udev is hal's replacement and running hal on a system which uses udev without the appropriate udev rules will result in hardware misbehaving. For example, flash drives losing data because of incorrect disk cache settings or your MP3 player not being recognized as such or your printer not supporting the resolutions the manufacturer claims it should support.
Additionally, unless you are using an enterprise supported distributions such as RHEL or SUSE (others I am sure), because hal has not been maintained for some years, no security fixes have been introduced and therefore user roles/permissions may not be correctly assigned to devices that are attached to the system.
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