I would never rely on CD/DVDs for long term data storage unless they were certified archive quality and they are expensive.
Define long term, I make a fresh image DVD every few months, making the previous obsolete, yet the
4.2 gig DVD from the old Win98 Fujitsu drive, 15 years old is still intact and I use it to write to my work partitions, those things that are still useful, even though the Fujitsu drive hasn't gone belly up.
However it is IDE, requiring the IDE PCI card I just put away in 2013, for reading.
Even my 12-inch LD collection of 300 disks[from better times] 'laser rot' or if you want to call it 'optical rot' only five of the LDs have symptoms of such, long since replaced by superior digital copies. I keep them around rather than send them to a landfill or like that scene in "Back to the Future II" where Marty
and Doc Brown are in the alley[2015] and you see un-sleeved [bare] LaserDiscs wrapped up on shipping pallets, ready for disposal (inside joke..as Universal had huge investment in Phillip's LD format in the 1980s). I trust optical/digital more than I trust magnetic, just one shot of EMP, or just a stray field from some bad electrical wiring, and poof.....magnetic storage gone.
Why do you think early Macs, Commodore and Atari computers had their OSs on ROM chips? all you needed back then were configuration files edited, on floppy or expensive 10Megabyte HDDs and you were good to go, lose a disk, and you could still bootup to the basic desktop.
Let's get this thread back on topic, I really wasn't expecting a debate on my days off....
To each their own......................