[root@admin policy]# pwd
/etc/hal/fdi/policy
[root@admin policy]# cat 70-zz.fdi
<?xml version="1.0" encoding="UTF-8"?>

<deviceinfo version="0.2">
        <device>
                <match key="volume.fstype" string="vfat">
                        <append key="volume.policy.mount_options" type="string">,uid=500,force,rw</append>
                </match>
  </device>
</deviceinfo>


$ tail -f /var/log/messages
Mar 27 19:57:45 admin mount-hal-fs: Mounting /dev/sdc1 to /media/usbdisk-vfat, label sdc1, type subfs, options fs=vfat,nodev,nosuid,noexec,noatime,procuid,iocharset=utf8,codepage=866,showexec,quiet,uid=500,force,rw