That's what I was thinking. I also started wondering how a large structure might be packed, when you can relatively address every byte in the nearest 256 bytes

That's what I was thinking. I also started wondering how a large structure might be packed, when you can relatively address every byte in the nearest 256 bytes but only every 4 bytes in the next KB and so on. It could sort of upend the way you might normally think about packing a struct.