IDE0_MAJOR 13 include/linux/root_dev.h Root_HDA1 = MKDEV(IDE0_MAJOR, 1), IDE0_MAJOR 14 include/linux/root_dev.h Root_HDA2 = MKDEV(IDE0_MAJOR, 2), IDE0_MAJOR 15 include/uapi/linux/major.h #define HD_MAJOR IDE0_MAJOR