this post was submitted on 15 Aug 2023
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132
ULTRARAM may be a silly name but it's the holy grail for memory tech and means your PC could hibernate for over 1,000 years (www.pcgamer.com)
submitted 1 year ago by ghostBones to c/technology
32 comments fedilink hide all child comments
 

I once speculated to a friend about 15 years ago that eventually solid state storage space would be so fast that it could serve as active memory. I can't wait to tell him.

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[–] [email protected] 4 points 1 year ago (2 children)

My initial thought was that everything would be stored in triplicate, then read in triplicate and 'voted' to the correct value, but I guess even that only extends the time before random bit-flips make the data unreadable. You're probably right on the need for active error checking if there is an intention to store anything long-term in this manner.

[–] [email protected] 13 points 1 year ago

TMR (so the tripilicate method) wouldn't be super suitable for this kind of application since it is a bit overkill in terms of redundancy. Just from an information theory perspective, you should only have enough parity suitable for the amount of corruption you are expecting (in this case, not a lot, maybe a handful of bits after a year or two). TMR is optimal for when you are expecting the whole result to be wrong or right, not just corrupted. ECC and periodic scrubbing should be suitable for this. That is what is done by space-grade processors and RAM.

[–] Num10ck 2 points 1 year ago (2 children)

wrapped in gold like a satellite?

[–] [email protected] 8 points 1 year ago

The gold around satellites are actually very thin layers of mylar, aluminum foil and kapton (a type of golden, transparent plastic) which are used to keep heat inside the satellite inside, and heat outside, outside (See Multi-Layer Insulation). Radiation shielding usually comes from the aluminum structural elements of the spacecraft, or is close to the electronics so you do not waste too much mass on shielding material. Basically, shielding efficacy is most determined by its thickness, so it quickly becomes quite heavy.

[–] [email protected] 2 points 1 year ago

That's not gold, it's just a heat sheet.