You pull a bunch of discs out of a box that have been there for years. They are warped from sitting there. I read people talking about how to straighten discs, boiling water for 1 hour, all sorts of crazy things. NOT NECESSARY.

HERE"S THE EASY WAY

Just fill a sink with real hot water, 125 degrees is all you need. Put the disc in for only a minute. Pull it out and put in on the floor or other flat surface till it cools. That's all you need to do. It's flat.

All that talk about boiling water, weights, not necessary. 125 degrees works fine forget weights.

I've had a disc get wedged between a few things and get a terrible warp in it. I just put it on the dashboard in the sun for a few minutes and it was like brand new.