Did it stop recognizing only DVD disks ? Can it read bluray DVD disks ? What is a data disk ? Is this a PC bluray disk player or a standalone bluray disk player ?
Anyway, first use a DVD cleaning disk before taking any other step and advise.
Thanks for the quick response. This is a stand alone Blu Ray Disc player. It was working good for 7/8 months now. All of a sudden, stop recognizing DVD discs. With data disc and bluray disc, it is working fine.