I have downloaded Fallout: New Vegas at least three times and when I try to play it it tells me that my disc is dirty or unreadable. Why does it do this with a download? There is no disc.
A dirty disc error on a downloaded title is almost always--excluding Forza Horizon--a bad download. It's possible your HDD is damaged and it's putting the data in corrupt sectors.
Clear your system cache, reboot the console, and then try to download the game onto a properly formatted USB drive and see if that resolves your issue.
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