StarThoughts said:

I'm not sure what issue you may have with “BD,” but your use of “BR” as an acronym for blu-rays is, quite simply, factually incorrect. The acronym is “BD,” and has been since the inception of the format.

You're incorrect on two points. #1 - BR is an abbreviation of Blu-ray, and BD is one of two possible abbreviations of Blu-ray Disc, and #2 an acronym is an abbreviation made from the first letter of each word that can be said either as a word or as letters, for example "ASAP", BD, BRD, and BR all fail to produce a clearly vocalised word, thus they are not acronyms (unless of course you're suggesting you can say BR as "burr").

There is nothing incorrect about writing "BR disc", just like there's nothing wrong with writing "DVD disc", the only thing that you can't do is write "CD disc" since that duplicates the word the same as in "ATM machine".

StarThoughts said:

Every single commercially available Blu-ray has a stylized “BD” logo on it somewhere. It looks like this.

So what? I can show you DVDs that have "digital versatile disc" printed on them, or in some cases on the cover, even though DVD doesn't stand for anything.