Flashing an image vs copying files

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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?

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Frant On BEST ANSWER

This is different because being able to copying files does require:

  • a partition to be defined on the drive/eMMC/USB key/SD card,
  • a file system to have been created/formatted in one partition.

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.