Yeah, companies have been trumpeting their ability to crank out discs that will last long after Martians come and evaporate our minds here on Earth for some time, but for archive junkies out there, more is always better. On deck today is Mitsubishi's ARLEDIA DVD-Rs, which reportedly feature corrosion-resistant coatings made from gold and silver. 'Course, you can only write to these at 8x, but they are expected to last about twice as long as traditional recordable discs. Not like you'll be around to prove 'em wrong, though.
