Digital storage media fail. Accept that. If you do not keep copies and keep media refreshed, either you do not wish to keep your images, or you are an idiot. Either way, it's your fault, not the fault of the media.
I've heard several people claim to do it. I don't believe them.
Amazingly, the movies that were available on Beta and VHS are now available for DVD and Blu-Ray, and one can even have their old 8mm Super 8 movies (which are GASP film) copied onto the most current media. Again, if you don't keep up with the technology changes, that makes you an idiot, it doesn't make technology bad.
All my files from Jazz and Zip drives were copied off long ago. What kind of idiot doesn't keep up with changes in technology?
In fact, all of my oldest CD's work just fine on my latest PC, but I understand that some go bad. That's why I keep newer copies of my important files. Again, what kind of idiot fails to do so, knowing that technology changes and CD's go bad?
That's the idea.
And tell me where one goes to get those JFK negatives that were destroyed in the 9/11 attacks. Where are they, huh? Film lasts forever, so tell me where they are, I want to see them. Come on, film is indestructible, so show them to me.
http://www.jacqueslowe.com/lost_negatives.php
Film lasts a good long time. Until your house floods or burns down or your kids throw your old slides in the garbage can after you cack it. Digital will last longer if kept up - and if not kept up, the person responsible is either not interested in keeping them, or they are an idiot. That's the way it is.