Is there a source regarding M-DISC being unable to hold up to their lifetime promise?
A quick google search brings up amateur-ish blog posts, and even those co sign the medium.
A quick google search brings up amateur-ish blog posts, and even those co sign the medium.
> The result of this study is that the GlassMasterDisc has a much longer lifetime in accelerated aging than other available DVD±R
I wouldn't draw any other conclusions on normal ageing of other tested media. They did an accelerated aging test at 90°C and 85% RH, where most discs didn't last a single test cycle (of 10 days), two discs lasted a single cycle, and only syylex lasted all 4 cycles.
Quote on a brand-name DVD
> This DVD model had the longest lifetime (i.e. 1500h) at 80°C and 85% RH. At 90°C, it is destroyed after the first cycle of 250 hours.
For an idea of what it does to the substrate:
> [for measurement] DVDs have to be taken [out] .. To prevent the formation of water droplets in the polycarbonate, it is necessary to "purify" the polycarbonate from the water that was absorbed at high temperature.
OTOH, I had CDs (Verbatim, upper middle class), of which about 1-2 of 50 had issues after 20 years storage (in dark, mostly room-temperature conditions).
It was a pupose-built test to see how much of X would Syylex take. It took X better than others, none of which took X well. Tests like these are very good, if you want to go with Syylex, to make sure it's not worse in some way (X, or Y, Z), which would then suggest a need for further examination. In real aging, factor X may be completely meaningless, while Y and Z are crucial, so you cannot conclude which one will last more.
Why test 90°C and 85% RH, not 80°C, 50°C or 110°C, or bending, UV light, scratching, drop in acid .. whatever? For a proper accelerated lifetime test, you would need to identify (all) relevant degradation modes and model their behaviour (and interaction) in target vs. accelarated test conditions, and then extrapolate behaviour in target conditions. They didn't even write what type of degradation they are testing.