Acccelerate CD/dvd player

The cd or dvd reader was mounted on /dev/cdrom

    sudo hdparm -d1 /dev/cdrom
    sudo cp /etc/hdparm.conf /etc/hdparm.conf_backup
    sudo gedit /etc/hdparm.conf

Add in this file, the following lines :
/dev/cdrom {
    dma=on
}