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Chapter Is Not Very Clear

What are Data Part1, Data Part2 … 3?
Is it some arbitrary way of dividing all data on a machine into smaller chunks and then create hash of that? Or is it each individual record?

Overall there are several questions and this chapter doesn’t provide the clear picture.

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Came here to say exactly this. The author would do well to get some help from experts because the level of depth here makes me doubt they themselves understand this.