I have an NS subscription and can usually get any article. I will try to get the text when I get to my machine (pasword is not memorable or changeable) But I guess the links above will tell the story.
Cheap CD's have a shelf life in year(s), VHS tape used by the record industry has about 10 years before the binder starts glueing the tape to itself (digital archives) and has print-though, gold CD's are all but impossible to find. We had this discussion about archiving a very important body of work in Gloucestershire from several collectors like Paul Oliver et al - it was considered a long-termm nightmare but vynil was considered the safest given the years of experience we can actually call on for evidence.
There is only one certain thing in life - Change and for those who cite death as another certainty - consider how big a change that is!