"just wondering if there was a minimum spec thats required for one of these"
I don't understand your question.
The minimum spec for a blue-ray device, or any other device for that matter - is surely that it works and does what it's supposed to?
And if it does what it's supposed to - then it meets the minimum spec. So on the supposition that any blue-ray writer writes blue-ray discs - then they all meet the minimum spec.