Bitsavers size

Rob Jarratt robert.jarratt at
Fri Apr 21 12:24:53 CDT 2017

> > My back of the envelope calculation comes to approximately
> > 4 million miles of paper tape.
> I think you're out by a factor of 10.... 267*10^9 bytes, divide by 10 as there are
> 10 bytes to the inch on paper tape, and convert to miles. I get just over 400,000
> miles.

Agreed, I measured a piece of paper tape I have here and got a figure of 0.9 inches per 10 bytes, so clearly just a bit of finger trouble somewhere in my calculation. Still, almost enough for a round trip to the moon.



> My rule of thumb is that a full reel of 1" paper tape is 100k bytes So 10 for a
> megabyte
> 10000 for a gigabyte
> 2,670,000 for all of bitsavers. Perhaps nearer 3 million as it's an
> approximation....

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