I remembered reading one question how would you back up the MBR of a disk
.
Two of the choices are
dd if=/dev/sda of=/dev/sdb bs=512 count=1
dd if=/dev/sda of=/dev/sdb bs=440 count=1
and the correct answer is
dd if=/dev/sda of=/dev/sdb bs=440 count=1
I am confused. Is the MBR size 440B or 512B ?