Sony Q30A keeps ticking on booting



Hi, I recently bought this DVD-RW and when i boot my machine with a dvd -cd on it begins ticking until i eject the disc. When a i put a disc after booting there is no problem. Is it ok this behaviour? or do i have to return it?
I burned verbatin and imation dvd-r media at 6x and my (dvd) ASUS DVD-E616 P2 gets a lot of work to read it. With a laptop dvd reader there wasnt too much problems and i did´nt hear the same noises.