This book provides a detailed description of the BIOS and its parameters. At the same time, various versions of BIOS from all well-known manufacturers are presented, including the most modern ones. When considering BIOS settings, recommendations are given for selecting the desired values. From this book you will learn how to improve the performance of the computer, optimize the operation of its individual systems (processor, RAM, disks, etc.) d. Learn how to solve problems. The whole chapter of the book is devoted to the description of errors and ways to fix them, and complete the book with a detailed description of BIOS flashing and a convenient alphabetical index, thanks to which you can use the book as a reference and at any time find a description of the BIOS option you need The book is written in a simple and accessible language. It does not require special training, as the presentation explains all the necessary concepts and technologies. Designed for a wide range of readers