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This user guide seems to be reasonably recent (2017) and answers your question. The solid state recorder (SSR) onboard JWST can hold at least 58.8 Gbytes of recorded science data. JWST downlinks science data in two 4-hr contacts per day; each contact can transmit at least 28.6 Gbytes of recorded science data to the ground. So it can hold about 1 ...

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