today I learned that we (as a civilization) now can put 16 silicon flash dice into a single 700µm microSD card on a commercial scale https://www.ose.com.tw/en/ic-services/memory-product-package/microsdsd

[whitequark@social.treehouse.systems]

if you think that the precariously balanced tower of flash above is an inaccurate representation of what's going on, i can reassure you that
(a) this is exactly how it looks like, and
(b) SK Hynix is up to 24 layers already (not sure in what application)

Semiconductor Back-end Process 4: Packages, Part 2

This article will explore packaging technologies that combine multiple packages and components within a single product.

SK hynix Newsroom - (news.skhynix.com)

[kirtai@tech.lgbt]

@whitequark
Is this the succulent flesh of which you spoke?

[samantazfox@infosec.exchange]

@whitequark That's fascinating O.O

[roukemap@social.treehouse.systems]

@whitequark interesting to think about the order of operations. How many dies do they stack before the first wire bonding pass. 4? 5? Do they trust placing a die right beside the freshly made wire bonds?

[updn@chaos.social]

@whitequark I did look into 3D architectures in uni, but still, wtf, especially the left picture, that's so uncanny...

[ignaloidas@not.acu.lt]

@whitequark@social.treehouse.systems kioxia does up to 32 high stacks (for larger SSDs but still) https://www.youtube.com/watch?v=ivLvsTnp9fI

[r@glauca.space]

@whitequark afaik this process also involves very carefully grinding the back side of silicon wafers (the side which doesn't have the transistors) in order to make all the dies as thin as possible

[amy@sk.girlthi.ng]

@whitequark@social.treehouse.systems the fact i can go to tesco and purchase this marvel of engineering will never not be extremely funny to me

[confusomu@twoot.site]

@whitequark fascinating to see microscope images of die stacks

[jernej__s@infosec.exchange]

@amy @whitequark At some point I bought a 1TB microSD card and completely forgot about it – until I found it a few days ago under the junk on my desk.

[whitequark@social.treehouse.systems]

@jernej__s @amy I had the same experience (I plugged it into my Steam Deck)

[jernej__s@infosec.exchange]

@whitequark @amy Hey, I just found another 1TB microSD card I forgot about!

[cm@chaos.social]

@whitequark and all that just to create a storage format that's too small for human hands to handle.

[whitequark@social.treehouse.systems]

@cm shhhhh... if you say that too loudly they'll make a nanoSD card

[cm@chaos.social]

@whitequark /me deletes previous toot

[realgene@hachyderm.io]

@whitequark
When are people going to be buying old cards on eBay to scavenge the gold wire?

[ruenahcmohr@infosec.exchange]

@whitequark .7mm ea * 16 = 11.6mm thick not inc. substrate........ thats a beefy card.?

[ruenahcmohr@infosec.exchange]

@whitequark oh wait, yea, its too early for me to be making social media posts, going to go get coffee. bbl.

[whitequark@social.treehouse.systems]

@RealGene they do buy ewaste for this already

[realgene@hachyderm.io]

@whitequark
Yup. I made a few bucks selling obsolete chips that happened to have gold plated caps…