james.miller said:successful:
betamax (profession use)
various camcorder formats
3.5" floppy disk as we know it today
crashed:
minidisc
betamax (consumer market)
sacd
umd
they are, afaik, sony owned formats.
You missed out atrac3 in the latter section, gave me no end of trouble and is the reason i refuse to give my money to sony if the choice is available.
I find it amusing that UMD can be defended as a portable gaming medium, i would advise anyone doing so to google WWE smackdown vs raw loading times, there's a video floating around showing that it takes 5 minutes from starting up the machine to entering a quick match, the loading times are totally unsuitable for a gaming medium, never mind the movie aspect.
As has been said by many, the PSP being a successful machine doesn't make UMDs the same, bearing in mind what Sony wanted the PSP to achieve as a movie machine its failed miserably.