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What type of early computer memory is this disk?

Asked by PhiNotPi (12681points) February 27th, 2012

I remember once seeing a large disk that was supposedly used as an early form of computer memory. It is a large, solid, glass-like disk that was about a foot (maybe more) in diameter. It was a light orange color and was relatively thin, maybe 1/8 of an inch.

So, what is this mysterious disk?

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