"Errors, errors everywhere, nor any drop to drink."
You may recognise this as a line from The Rime of the Ancient Mariner by Samuel Taylor Coleridge.
It's a tale of those lost at sea, and it laments the cruel irony of being surrounded by errors in a digital sea but unable to drink any of them due to their salty content. Wait, no, this is wrong.
It's actually about water, but much like water, an error can really mess up your attempts to play a video game, and in this case, Modern Warfare.
So, if you're here because you want to fix the Modern Warfare disc read error 3.1, then we've got you covered. Also, you nearly learned something new today too.
Why do I keep getting the Modern Warfare disc read error 3.1
The disc read error 3.1, is an error that first popped up when the Modern Warfare released. Over a year later and despite some other bugs being fixed, this one just isn't going away.
It'll appear as you're playing or loading up the game, and it'll render the game completely unplayable as a result.
Dealing with that is a big pain in the butt, but you can fix it if you know how.
How to fix the Modern Warfare disc read error 3.1
We've got some bad news. The main fix for this error is to delete the game entirely and then reinstall it. This is a very time-consuming endeavour, though not a very involved one at least.
However, Infinity Ward has since optimised Modern Warfare's file size following the launch of Black Ops Cold War, so the wait might be slightly shorter, especially if you only choose to install select elements of the game.
Other things that can fix it are updating your drivers for your graphics card on PC too. This can make sure that things are running as smoothly as possible. There's also a fix going around that has worked for some people, and that's to disable any overlays you may have running on your PC. This includes apps like NVIDIA Experience and Discord.
We'd also recommend attempting to repair the Modern Warfare files, too. Using the Scan & Repair tool in the launcher for Call of Duty: Modern Warfare, which should be found in the Options menu, may find that you are missing some data or content, and will then download it for you.