Quite a few bioes only check to see if the boot signature is there, and don&#x27;t bother validating the partition table, so effectively you can use those bytes if you don&#x27;t care about compatibility.<p>Wikipedia has a good article to dust the memory off: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Master_boot_record" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Master_boot_record</a>