You know what formatting means, my grandmother does not. For the sake of less tech savvy users there should be a warning if the operation is dangerous in the sense that it will delete data. Maybe not as part of the question but as a sentence before, in another paragraph, so that you can easily skim it, while others may read it.
That's exactly the point though - you want to make the UI deep. Ideally when I hit "Format" I should get a confirmation dialog warning that I'll irreversibly erase things, with an "expand" button for more information. But, as a power user the correct button to hit should be self-evident without actually reading the dialog at all.
This way the user can go as deep or shallow as they want without losing context.
