If the disk is made from Kevlar or Dragonskin then I could see it's usefulness..... Otherwise I just think of this e-mail I got awhile back:
Repeat after me.......
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
I will never complain about my kid
This could have been your kid.......