[AaronFriel]

Given the capacity, I would be surprised if it wasn't single-level cell NAND (larger write capacity) or redundant. From articles I could find, it was installed in the JWST in 2012[1] and developed by a company called SEAKR which produces "Solid State Recorders"[2]. Certainly doesn't look like any commercial server storage I've seen.

I imagine the contracts could be FOIAed here and specs like anticipated write capacity obtained, would be very interesting to learn about radiation hardening and redundancy for SSDs - err, solid state recorders - in space.

[1] https://www.electronicsweekly.com/news/business/information-... [2] https://www.seakr.com/our-technology/#products

[bigiain]

> From articles I could find, it was installed in the JWST in 2012

I suspected something like that. I assumed there was a reason there was "only" 65GB of storage up there, when I can get a half terabyte microSD card for under $70 on PrimeDay. Lots of Moore's Law has happened in the last 10 years...

As a RaspberryPi enthusiast, I'm under no illusions about the reliability of microSD cards, but I wonder whether if they were building that data recorder today, that a huge raid 1 with perhaps 20 or 50 mirrors stored on 512GB SD cards might be able to compete on reliability and cost (including launch weight)?

[mcnugget]

Bit flip probability is inversely proportional to density of the storage media so denser might have you run into issues. Also theres no point on building a recorder that's 10x larger than what you need if you're going to be limited by downlink availability. You could probably get away with all those SD cards in LEO though for a short missions, JWST falls into the category of missions where the price of that storage medium is going to be a rounding error vs the price it would incur if it randomly failed during qualification.

[hoseja]

It would still be better to have 10-100x in enterprise-grade storage with, say, quadruple redundancy. As Ingenuity has shown.

[mschuster91]

> As Ingenuity has shown.

Bad comparison - Ingenuity was spec'd for five 90 seconds flights [1], JWST for up to ten years, depending on how much they have to use its rocket engines.

[1] https://en.wikipedia.org/wiki/Ingenuity_(helicopter)

[2] https://www.americanscientist.org/article/jwsts-limiting-fac...

[pkaye]

Another reason for the 65GB of storage is that storage is only used to buffer a day worth of transmitted data along with the previous days data till reception is confirmed.

[formerly_proven]

> https://www.seakr.com/wp-content/uploads/2016/08/Flash_FMC-G...

Looks like any other SSD from a few years ago, just bigger and in a metal box.

> The GEN3 FMC is a 192 GByte card designed for space applications. It is a standard 6U cPCI form factor composed of 3 cards: the main controller card and two memory mezzanine cards. It supports data and control transfers via the backplane cPCI bus.

[AaronFriel]

That's just a flash card. It's not the solid state recorder.