An anonymous reader writes "As everyone who uses Netflix knows, scratches on DVD are frustrating and
create significant customer support costs. Blu-ray is the first major disc format to
address the problem. The chemistry
  
behind these coatings
a radical-curing urethane(meth)acrylate and a curing monomer, and is applied
unformly over the disc. The results are impressive — this
shows a Blu-ray disc surviving steel wool and a pizza cutter,
which would have destroyed traditionally-coated formats (e.g., CDs, DVD, or HD-DVD).
Fewer scratched discs also means less waste."