LOUD Clung CLUNG sound

I have a plextor PX-740A. WHen i inserted a blank dvd disc and close the drive, the drive make a reallly loud nonstop clung clung sound and when i eject the drive, it stop. THen i closed the drive again, it make a loud noise for like 15 secs and it stopped. WHat can be the problem?

The drive tries to recognize the mediatype and if it’s blank or not…