There's also the matter of heat. You see, when a machine is spinning something, this is called shaft work. This shaft work contributes to the energy of the system - the CD, in this case. Because energy is conserved, this shaft work in must be converted to some other energy out (let's see... closed system, non-steady, non-adiabatic, rigid, non-isolated, no change in potential or kinetic energy). So the massive amount of shaft work is converted into the internal energy of the CD - the CD's heat. The CD is heated up by nearly a hundred kilojoules, and promptly explodes, because the CD's component molecules have to much energy to be held together by their normal bonds.

(Thank you, Aero 241)