This book is Volume 3 of the series, FYSOS: Operating System Design, and will show the reader how to detect, initialize, and communicate with three of the most common media hardware devices, the Floppy Disk Controller, the IDE Hard Disk Controller, and the SATA (AHCI) Hard Disk Controller. The reader will learn how to detect the controller, what type of controller it is, initialize it to default values, detect attached devices, and then communicate with those devices, such as reading and writing to the attached media. All of this is done without any outside help, such as operating system...