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what do you think is going to be the next universal media format?

from 8 track to cassette to cd to mp3
from vhs to dvd to hddvd to blueray
from mpeg to avi to mp4 and psp

where is this leading? when will we have a universal format?
one format that all devices can use.
i have a feeling that it won’t be a disk or anything with moving parts. i kinda think that movies will be sold on little flash drives in a format that all computers, tvs, media players will recognise.
I think that all digital media will someday be purely digital. ie, code. your video camera records onto an internal harddrive. when you get home, wirelessly upload to your home/server for archive and wirelessly to your TV to play.
I think the need to go to a store to buy this code burned on a disk will be obsolete, when you can just download the code from the net instead. iTunes already does this.
So again, what do you think the next universal format is going to me? I think first we need to decide on a universal code, then the media it’s written to can be anything.