in this particular case, i don't see TM issues.
we have mp3 domain names, DVD domain names, etc. since years, although there are some registered trademarks, but i think together with the LOGO etc.
and also the full registered name here is "Blu-ray Disc"
however, few weeks ago i found DVD Cleaner, or DVD disc cleaner and CD ROM cleaner .com domains etc. and posted these names in AVAILABLE DN section and didn't register them.
this name could be a xx - xxx name in few years.