How Does Dis Checker Work?

A lot of times you don't write a scrip like this from top to bottom. You combine other tools that people have. The way it checks that is by kind of this implicit safety signal, like figuring out whether or not the first disk is empty. But i mean, you could see how somebody would do it, right? And that's, that's, you know, kind of what they ware getting at is, there are some things that are dangerous.