I'm sure there's a reason but I don't get (1) why 68GB SSD vs standard 64GB and (2) why 64-68GB, why not 128GB or 256GB. The additional weight is literally negligible.
The Webb Space Telescope’s Profound Data Challenges - IEEE Spectrum
Quote:
Compared to Hubble, which is still active and generates 1 to 2 gigabytes of data daily, JWST can produce up to 57 GB each day
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Data gathered from its scientific instruments, once collected, is stored within the spacecraft’s 68-GB solid-state drive (3 percent is reserved for engineering and telemetry data). Alex Hunter, also a flight systems engineer at the Space Telescope Science Institute, says that by the end of JWST’s 10-year mission life, they expect to be down to about 60 GB because of deep-space radiation and wear and tear.
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