4120B - Strange noise after inserting DVD R/RW +/- media


I have this burner for a few day and it works grate. The only thing that seems strange is thant 10 s after inserting a DVD R/RW (+/-) media a strange, short, constant noise takes place. Is it normal for this burner ? Bios A102. I recorded the noise in mp3 format so if someone would like
to help me I can send the file by e-mail.