Page 1 of Portable dvd player

I brought a goodmans 5 inch portable dvd/tv player the weekend from bootfair for £10 and it works fine. Just looked at the manual on the web and it says that to keep away the player from magnets, and I was wondering why. My player come into contact with a magnet in the back of the car but works fine., Any idea why the player shouldn`t come into contact with magnets???

strong Magnets can wipe out VHS recordings and and warp cds and circuit boards and distort the sound so keep away from strong magnets.