Even better that just having more buffer, and I'm not sure why nobody thought of this for DVDs, would have been to distribute the data in a RAID-like way, with parity blocks on diametrically opposite areas of the disc. So you could completely obliterate any part of the disc and as long as enough bits could still be read elsewhere you would sill get 100% of the data. As it is, everything is still laid down in a continuous spiral (not even concentric circles like a CD) and assumes the data is accessed sequentially, with the additional error correction bits right next to the data they're protecting. I should file a patent...
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