I’m not exactly sure. I have a few ideas: As a digital code of 1’s and 0’s — which translate to ons and offs depending on voltage in a semiconductor…. (or, uhh, on the hard drive— a spinning magnetic disc which can encode a sequence of digital writing)…. but nothing too solid for you to go one… I suggest you read up on basic digital systems and electronics, specifically semiconductors…. this is where they get Silicon Valley from….
but here’s an excellent description: “
Historically, early computers used delay lines, Williams tubes, or rotating magnetic drumsas primary storage. By 1954, those unreliable methods were mostly replaced by magnetic core memory, which was still rather cumbersome. Undoubtedly, a revolution was started with the invention of a transistor, that soon enabled then-unbelievable miniaturization of electronic memory via solid-state silicon chip technology.
This led to a modern random-access memory (RAM). It is small-sized, light, but quite expensive at the same time. (The particular types of RAM used for primary storage are also volatile, i.e. they lose the information when not powered).
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