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Difference between reading from / dev / block / mmcblk 0 and / dev / block / mmcblk0p1

Reading from / dev / block / mmcblk 0 returned the old data while reading from / dev / block / mmcblk 0p1, giving the latest data. My question is, does linux support backup if data is written to / dev / block / mmcblk 0? This is because I was able to read the old contents of the SD card by reading this node.

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The mmc subsystem in the Linux kernel registers nodes of a format device mmcblkXpY.

  • Each mmc device registered in the Linux kernel gets its own mmc X device number .
  • Y

- node, .

, /dev/mmcblkX , /dev/mmcblkXpY.

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