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It is impossible to conjure an accurate number. However, an assumption was made with the Digital Universe Study found in the related link, stating there were an estimated 1.8 Billion Terabytes in existence.

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Q: How much storage data exists today in characters or bytes?
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What was the memory capacity of first generation of computer?

On word oriented machines it varied from 1000 words to 32000 words (roughly 12000 bytes to 192000 bytes).On character oriented machines it varied from 20000 characters to 80000 characters (roughly 20000 bytes to 80000 bytes).A few machines were smaller than this, a few were larger. Also if the customer was willing to pay enough, the manufacturer could usually customize things for him.


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