The map installer program /sbin/lilo updates the boot sector and creates the map file. If the map installer detects an error, it terminates immediately and does not touch the boot sector and the map file.
Whenever the map installer updates a boot sector, the original boot
sector is copied
to /boot/boot. number, where number is the
hexadecimal device number. If such a file already exists, no backup
copy is made. Similarly, a file /boot/part. number is
created if LILO modifies the partition table. (See page .)