datahoarder
Who are we?
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
We are one. We are legion. And we're trying really hard not to forget.
-- 5-4-3-2-1-bang from this thread
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The spot size is the size of the point the laser focuses on. It seems with the material they've used that there is some kind of interference between the two lasers they use to make a pit smaller than you would expect. There's not a whole lot of information in the article to understand the details. Also, I'm just a guy who works on lasers, getting C's in my optics class currently so take it with a massive dose of salt