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Any physical storage media is going to degrade sitting in the direct sun for a month. A HDD or flash media might survive but it's life and reliability definitely got cut shorter.
The more important thing is the manufacturer, there is only a few companies that make them and most are rebranded. There is review here from extensive testing of many brands over many years here. Ideally you want Mistusbish or TY's (Taiyo Yuden) as the manufacturer. The TY's were so popular among hobbyists a few years back they were counterfeiting them.
No burnable media will ever last, commercial discs are thin metal and pressed very much like a record would be. The burnable media is a chemical and etched with a laser, this will inevitably degrade. Could be unreadable tomorrow or 100 years from now. You can have a batch of ten thousand discs even from the best manufacturer and inevitably a few will already be bad.
While on the topic do not buy RW's unless you have a purpose for them and the data is of no concern at all, these have the worse failure rates. Burnable Discs should never be used as backups with one caveat, they are untouchable from ransomware. I've been backing up the most important data I have to disc but this only for worse case scenario. hopefully if the need arises for them they work.
Just go to your local library, find a chair within view of the checkout, and watch how many people check them out by the basket full.
People were doing the same things back when VHS tapes were around though, up until the day they stopped making them. Eventually its times to move on to the next media.
Look at VHS tapes/ VCRs, they existed from about early to mid 80s up to about late 90s, early 2000s.
Not sure yet about the claims of archival stability, time will tell.
I've found they seem to work better in older (pre-2005ish) and cheaper (cough Coby Apex Norcent cough cough) DVD-Video players than conventional dye-track DVD+R. Physically they're more similar to a stamped disk so the difference in reflectivity (small holes burnt into a thin plastic film vs. dots printed in dye) is probably also similar. Because at present the blanks are several orders of magnitude more expensive than conventional DVD+R they're very impractical to use as one-offs or your everyday bang-around "let's watch a movie" DVD. They are good to use as your long-term master disks (i.e. once you've removed all the commercials, CSS, region coding, foreign-language audio and other useless crap with DVD Shrink) that you'd strike your everyday bang-around "let's watch a movie" DVD+R from, or as long-term archival computer backups.
They have GOT to do something about the product's long name, though. God.
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