Lies Dvd

Why do DVD-r manufacturers lie to their customers?

It says 4.7gb capacity on the case, so I made a movie file 4.6gb (it took ages) and now I try to burn it and it turns out they all only actually have 4.3gb capacity, could I sue them for false advertising?
Damn Windows!

Yes, sue them for the love of real mathematical calculations which end up being points of regression!

McFly – Lies Live At Wembley DVD