In a copy operation why does macOS Big Sur send a lot of packets to the hard drive it is copying from?

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Copying a large file from an external hard drive to a Mac, shows a lot of packets first going to the hard drive.

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Then there is a period of no disk activity.

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Then what I expected happens, packets arrive to the Mac from the hard drive.

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What is the Mac sending to the hard drive before the copy operation?

Author: Subham

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