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dd bs=4m iflag=fullblockvsdd bs=1111and notice the substantially higher data rates the former will give you. This is because the former aligns with natural block sizes on the SD card, while the latter requires the SD controller to do much reading, copying and reflashing to write partial physical blocks. The importance offullblockshould not be underestimated, by the way, as without it,bsis only a maximum and partial reads could lead to persistent subsequent misalignments.