Surely they’re not able to track individual discs though? Two copies of the same game should be identical.
https://www.trueachievements.com/news/xbox-disc-2-digital-update
From the above article:
Well, thankfully, it doesn’t work like that [the console physically marking discs]. While it’s not applicable to every physical Xbox game (we’ll circle back on that detail shortly), compatible Xbox discs feature a unique identifier that can reportedly be picked up by Xbox consoles. Once scanned and claimed for your account, the license to play the digital version of that game will be yours, but it’s a conditional license.
To maintain access, your Xbox account will need to be the last one to have used or claimed that physical disc. So long as you were the last to use it, you won’t need to insert the disc to play the game. However, if someone else uses that disc on their Xbox console, or attempts to claim it for their digital account, they’ll take ownership of the game’s digital license, and your access to the digital version of the game will be revoked.
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