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"Real science opens windows for us to look through. We're right at the footsteps of the most interesting scientists around."
- Larry Niven

Welton Cube  
  High-density storage device.  

"I can use it to write the sort of commentary you want, and take time to miniaturize and stabilize a message. The problems of a time-tripping historiogapher are odd and awkward. One Welton fine-grain memory cube would record all I could say over the next ten years--except that I would have no use for one even if I had it; the technology to use it is lacking.

"By to way--Ishtar, did you plant a recorder in my belly? You are a darling, dear, but sometimes a devious darling--and there is something there.

... But I suspect that it is a Welton cube with an ear hooked to it and a ten-year power supply; it is about the right size."

From Time Enough For Love, by Robert Heinlein.
Published by Putnam in 1973
Additional resources -

They were also used for making backup copies:

"But when I started worrying I started trying to do something to protect the records. I instituted a policy of making dead-storage duplicates of all processed data at the point they enter the Archives. I had in mind copying the entire Archives, then shipping them somewhere. But I had no funding, or enough money of my own, to pay for the memory cubes. They should be Welton Fine-Grains, or they would be too bulky to ship.

Thanks to an anonymous reader for the quote and tip for this item.

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Additional resources:
  More Ideas and Technology from Time Enough For Love
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Time Enough For Love
  Tech news articles related to works by Robert Heinlein

Welton Cube-related news articles:
  - Hybrid Memory Cube Is Speedy And Compact
  - Sandisk 1 Terabyte SD Memory Card Surfaces

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Sandisk 1 Terabyte SD Memory Card Surfaces

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