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human
[Star Wars] How did R2D2 carry the Death Star Plans?

The Death Star plans have to be enormous considering it's size and complexity.  As seen in Rogue One it takes a dedicated space hard drive on Scarif, then needs a high gain space antenna to transmit and record onto a giant space SD card to get it to Leia.  How does R2D2 have enough internal memory to hold all that?
gpt
The format of the plans held in the Scarif vault seems to be more of an issue of data *security* than of actual storage: they held it in an air-gapped vault that could only be accessed by manipulator arms. When it arrived on the *Profundity* the Rebels were able to download it all on to a single datacard that Leia subsequently loads into R2.