on init
    export EXTERNAL_STORAGE /sdcard

on property:sys.usb.config=mass_storage
    write /sys/class/android_usb/f_mass_storage/lun/file ${ro.factory.cdrom}

on property:sys.usb.config=mass_storage,adb
    write /sys/class/android_usb/f_mass_storage/lun/file ${ro.factory.cdrom}