Hello Photo Engineer and others here, do you remember Kodak Photo CD? It was an early digital technique designed to let you see your slides on a television via a small playback machine (like a VCR). I tried it in the mid-1990s with mixed results. Some of the CDs based on Kodachrome 25 film were fantastic, but others were poor. The quality of the work by the subcontractor or scanner operator must have been quite variable. Regardless, I have several of the CDs from which I want to extract the .PCD files. My older version of ACDSee Pro reads the files, but does not properly interpret the odd dynamic range technique that Kodak used to make the files look correct on the American NTSC televisions of the 1990s. Older version of Photoshop would properly convert the files, but no one at my office could find an old Photoshop, so that was not an option. There is a commercial program for Mac that is supposed to convert properly, so I better buy it before that option disappears forever. So this is an example of a digital format only 20 years old that is only semi-readable. (Note, I have the original slides, but I prefer not to scan them, which would take days.)
Quite good analysis Kodachromeguy. I would agree with. And a good example of being unsafe not only from hardware but also from software and data standards.If the standards will change a decade later the game could be over.Well JPEG will not change so far (JPEG 2000 did not solve it's task) but what about the much different RAW codecs (some camera manufacturers like Nikon for example use different types within the same camera family) I am using no digital camera (one of my Nikon F80 is broken caused from too much plastic

- better bougt F3,Fm3, F2)But I realy would not trust the livetime of some often changing RAW formats over a time horizon of more than two decades.(hope this is not too much digital content now
Coming back to the main issue :
How less complicate is it to store negatives and slides with a timeline
of much more than 5 decades.
with regards