Do we need a some specific media player and a Blu-Ray ROM like we have DVD ROM for DVD?
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I don't understand your question.
What Sony model(s) are you asking about? Are you trying to play blu-ray discs on a PC or a TV?
For a PC you will need a compatible BD Optical Drive AND a software BD Media Player like WinDVD BD or PowerDVD BD. To play to a TV you need a BD Player that connects to your TV by HDMI.