Booting a computer, cold boot, warm boot

Booting a computer

1. Welcome Good Morning Students

2. Booting of a Computer System Parwat kumar Shrestha Adarsha Information Technology Biratnagar-09

3. Objectives By the end of the session, the Junior Computer Technician (JCT) will be able to Define “Booting” Discuss the types of Booting List the steps of Booting Define warm booting and cold booting Recall the system files.

4. D efinition Booting is the process of loading the system files (Io.sys, Msdos.sys, command.com) in computer memory.

5. Why is Booting Required ? Hardware doesn’t know where the operating system resides and how to load it. Need a special program to do this job – Bootstrap loader . E.g. BIOS – Basic Input Output System. Bootstrap loader locates the kernel, loads it into main memory and starts its execution.

6. Booting Process POST B I O S IO.sys Msdos.sys Config.sys If present Command.com Autoexec.bat If present C:\> ROM RAM Power Button

7. Tasks performed at boot up

8. How Boot process occurs ? Press the Power button on then the CPU begins executing the instructions in the ROM BIOS. The BIOS performs the power-on-self-test (POST). If the POST tests are successful then it loads the Io.Sys and Msdos.Sys file in RAM memory. If there is Config.Sys file in boot disk, config.sys is loaded into memory and processed. Again Command.com is loaded in RAM Memory After that Autoexec.bat file is loaded in RAM Memory. It contains all of the commands that the user wants to execute automatically every time the computer is started. As the final step in its boot process the computer displays the Dos prompt.

9. Types of Booting Warm Booting Cold Booting

10. Warm booting The booting which is performed from the power on stage by pressing Ctrl + Alt+ Del keys simultaneously or pressing reset button of the computer is called warm booting.

11. Cold Booting Booting is performed by switching on the power from the power off stage, the computer searches the system files and loads them to the computer’s memory is called cold booting.

12. Examples WIN95/98/ME BOOT PROCESS WIN2000/NT/XP BOOT PROCESS WINDOWS VISTA / 7 BOOT PROCESS

13. Analogies

14. Summary of the Boot Sequence POST MBR IO.SYS MSDOS.SYS CONFIG.SYS COMMAND.COM AUTOEXEC.BAT Command prompt

15. Any questions …

16. Review What is Booting? Name the system files? List the types of booting Define warm booting and cold booting. What is the full form of BIOS. What does the POST mean.

17. Assessment: Short-Answer What is Booting? List the System files of computer Name the types of Booting

18. Thank You