I just read on interesting blog post earlier:
ASCII by Jason Scott / Floppy Disks: It’s Too Late
tl;dr Most 5.25" floppies are unreadable without special equipment due to decay, along with a noticeable amount of 3.5" floppies.
How does everyone else feel about the decay of old media? My first computer use involved using a lot of 3.5" floppies, and I reckon a few of those are probably unreadable now, but it's not like I have a drive to check them in anymore. Still, I was about 7 when I recorded them, and all that I'll be losing is a few 640x480 Pokemon wallpapers which are probably on the internet anyway and some MS Paint doodles.
For a lot of people older than me though, they might have had important data stored on those drives.
On top of that, the expected lifespan of a CD-R is ten years. CDs were first released in 1990, and CD writers were first affordable around 1999 sometime. Given that the expected lifespan isn't exact, and we're talking an error range of several years either way, a lot of early CD-Rs are probably now unreadable too. Unlike floppy discs, I did have a lot of stuff stored on CD-Rs as my parent's first computer also had a CD writer. Given my parents bought the cheapest CD-Rs going, that's probably pretty much all unreadable, if I could find them anyway.