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Several years ago now I tested the longevity of writeable DVDs and found that DVDs exposed to daylight and sun for 3 months on a windowsill became completely corrupt.
Since 2011 I've been trying out a similar test on a Blu Ray disc.
On NOV 2011 I burnt a Blu Ray disc with episodes of a TV series and also included an MD5 hash test file.
This was a VERBATIM METAL NITRIDE DISK NOT A DYE BASED DISK since I assume such disks will still be subject to the same corruption as DVDs since they use the same type of dye.
It was left in a folder for about 2 years (basically cos I forget it!) then when I found it again I checked it and it was perfect (apart from 2 very small discolorations on it).
Then I fixed the plastic case to a window so the daylight and the sun could shine on it all day long (when we had sun of course).
That was about 5 months ago so the disk has been subjected to varying daylight and a fairly good amount of direct sunlight.
And the results - well so far NO PROBLEMS!
All files check out as good according to the MD5 hash and they also play normally.
So if you want archival quality and an added backup medium it seems that Blu Ray Metal Nitride disks can provide it.
Since 2011 I've been trying out a similar test on a Blu Ray disc.
On NOV 2011 I burnt a Blu Ray disc with episodes of a TV series and also included an MD5 hash test file.
This was a VERBATIM METAL NITRIDE DISK NOT A DYE BASED DISK since I assume such disks will still be subject to the same corruption as DVDs since they use the same type of dye.
It was left in a folder for about 2 years (basically cos I forget it!) then when I found it again I checked it and it was perfect (apart from 2 very small discolorations on it).
Then I fixed the plastic case to a window so the daylight and the sun could shine on it all day long (when we had sun of course).
That was about 5 months ago so the disk has been subjected to varying daylight and a fairly good amount of direct sunlight.
And the results - well so far NO PROBLEMS!
All files check out as good according to the MD5 hash and they also play normally.
So if you want archival quality and an added backup medium it seems that Blu Ray Metal Nitride disks can provide it.