This article is another case of regurgitated received folk wisdom that is wrong and that has been wrong for years if not decades.<p>> <i>The processor starts working in real mode.</i><p>Intel CPUs have not started in real mode since the 80286. The 80386 and later start in <i>unreal</i> mode. The whole explanation of real mode addressing, based upon not realizing that the 80386 and later <i>always</i> use the segment registers and do not do that real mode address calculation using the value of the selector, is irrelevant. Futhermore: In some scenarios nowadays, CPUs <i>never</i> run in real mode, going straight from unreal mode to protected mode and, because they then run a protected mode EFI bootstrap, staying there.<p>> <i>When attempting to boot from a hard drive, the BIOS tries to find a boot sector.</i><p>PC systems have not necessarily loaded the MBR and run it for more than a decade, now. Systems bootstrap the EFI way, and this is nowadays fairly common and mainstream.<p>> <i>The core image begins with diskboot.img, which is usually stored immediately after the first sector in the unused space before the first partition.</i><p>This "boot virus area" does not exist on modern systems with EFI partitioning. That is also common and mainstream nowadays, too.<p>* <a href="https://superuser.com/a/347115/38062" rel="nofollow">https://superuser.com/a/347115/38062</a><p>* <a href="https://superuser.com/a/345333/38062" rel="nofollow">https://superuser.com/a/345333/38062</a><p>* <a href="http://jdebp.eu./FGA/efi-boot-process.html" rel="nofollow">http://jdebp.eu./FGA/efi-boot-process.html</a><p>* <a href="http://rodsbooks.com./efi-bootloaders/index.html" rel="nofollow">http://rodsbooks.com./efi-bootloaders/index.html</a>