I&#x27;ve mostly used Wikipedia, <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Design_of_the_FAT_file_system" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Design_of_the_FAT_file_system</a> . Also a little bit the dosfstools source code.