gomezc on 03 September 2008
To me it's got to be VHS to DVD. Going from a tape medium to optical disc drives. I still remember a lot of confused adults trying to figure out how to work a DVD player during the transition. At least with Bluray, all it is, is a larger storage medium with higher capabilities than the previous one.
Also blu-ray players can play back DVD's from the same drive. DVD players had to have a special slot to playback VHS's, and now you're seeing less of them.
