I would like to understand how is flashing an image on device or partition is different from copying same set of files to the device?
Flashing an image vs copying files
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This is different because being able to copying files does require:
When you flash an image, you flash all of the partitions, file systems, files in the file system that were existing on the drive/eMMC/USB key/SD card the image was created from.
Bottom line, you cannot copy files on a blank drive/eMMC/USB key/SD card, but you can write an image into it.