L01-Booting Process.pdf

Reference Books 1. Abraham Silberschatz, Peter B. Galvin, Greg Gagne, Operating System Concepts. Sixth edition. Addison-Wesley (2003). 2. Andrew Tanenbaum, Modern Operating Systems, Prentice Hall. 3. William Stallings, Operating Systems, Prentice Hall. 4. Harvey M. Deitel, An introducti...

Reference Books 1. Abraham Silberschatz, Peter B. Galvin, Greg Gagne, Operating System Concepts. Sixth edition. Addison-Wesley (2003). 2. Andrew Tanenbaum, Modern Operating Systems, Prentice Hall. 3. William Stallings, Operating Systems, Prentice Hall. 4. Harvey M. Deitel, An introduction to operating systems. Addison-Wesley. 5. Andrew Tanenbaum & Albert Woodhull, Operating Systems: Design and Implementation. 6. Prentice-Hall. 7. Douglas Comer, Operating System Design - The XINU Approach. Prentice-Hall. 8. A.M. Lister, Fundamentals of Operating Systems. Macmillan (1979). 7/26/2024 1 Booting Process When we switch on our computer system certain logical steps take place after this computer loads the Operating System and passes the control to it. This process is known as Booting Process and steps are shown in the figure. 7/26/2024 2 Booting Process Booting process begins with Power on Self Test (POST). In this step, computer checks Itself to see if the basic devices (viz, keyboard, mouse, printer, video etc.) are connected with the processor. For this it sends pre-defined signals to these devices and expects pre-defined responses back from these devices. Then Basic Input Output System (BIOS), which Is a part of computer’s Read Only Memory (ROM) performs checking the memory of the computer. 7/26/2024 3 Booting Process Then BIOS reads the disk sector where flies are needed to start the operating system. The area of the disk where there files are located is called boot sector. These files are very important for loading the operating system. If they are not present, the computer cannot start its working. Once these files are loaded, few more configuration files are also required which contain what to do upon the start up of the computer. - 7/26/2024 4 Booting Process After fourth stage, booting process is completed and now operating system takes control of the computer. MS-DOS OS comprises of the following files IO.Sys MSDOS.Sys Command.Com Config.Sys Autoexec.bat 7/26/2024 5