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Testing DVD-R and CD-R 25 years later: optical disks from Japan
As it turns out, “thrift shopping” in Japan via the internet can be both very enjoyable as well as very dangerous. In this series of posts, I’ve been examining various optical med…
The graphs seemingly show how PI error rates evolve over exposure compared to an ordinary DVD, making the case that the UV guard coating improves longevity. It would seem that compared to “clear” hub areas which transmit about 90% of light in the case of DVDs (losses likely due to surface reflections, scattering in adhesive), the TDK disc actually shows a dip in transmission for wavelengths shorter than 500nm. On the TE/FE test, it seems this disc has more FE than expected, but at high speeds, it’s got a characteristic that doesn’t show the hockey-stick behaviour at the outer edge which is usually a sign of good quality.
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