From Syslinux Wiki
A boot sector is a region of a storage device that contains code for booting programs. There are several type of bootsectors
- Bootsector of the IBM PC, heritage still in use.
- Bootsector as Intel defined it, it is named FIXME
- Bootsector Microsoft start using since FIXME, it is called FIXED
- Bootsector in Apple hardware with Intel processor, could be one of the above.