1. WHO IS IN CONTROL? YOUR COMPUTER OR YOU?

2. WHAT HAPPENS WHEN YOU TURN ON THE SWITCH

3. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS CONFIG.SYS (optional) COMMAND.COM (shell command in config.sys may change this!) AUTOEXEC.BAT (optional)

4. Boot-Up Sequence

5. Boot-Up Sequence ROM/BIOS

6. Boot-Up Sequence ROM/BIOS POST

7. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data

8. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A:

9. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C:

10. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?)

11. Disk Structure OS/2 Novell Unix MS-DOS MS-DOS allows for a maximum of four different operating systems on the same physical disk drive

12. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition?

13. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?)

14. Boot-Up Sequence

15. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS

16. Boot-Up Sequence

17. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions)

18. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS

19. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS CONFIG.SYS (optional)

20. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS CONFIG.SYS (optional) COMMAND.COM (shell command in config.sys may change this!)

21. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS CONFIG.SYS (optional) COMMAND.COM (shell command in config.sys may change this!) AUTOEXEC.BAT

22. Boot-Up Sequence ROM/BIOS POST Switches or CMOS Data A: C: Master Boot Record Cyl=0 Head=0 Sec=1 (valid 55AA?) Bootable Partition? Boot Record (pointed to by C/H/S in MBR) (valid 55AA?) IO.SYS DBLSPACE.BIN (not all versions) MSDOS.SYS CONFIG.SYS (optional) COMMAND.COM (shell command in config.sys may change this!) AUTOEXEC.BAT

23. RAM GETS LOADED BIOS DATA COMMAND.COM DOS

24. Working From The Command Prompt C:>_

25. DOS BASICS DOS = DISK OPERATING SYSTEM

44. Disk Structure 0 1 2 3 Cyl = 0 Cyl = 200

45. Disk Structure 1 2 3 4 5 6 7 8 Each sector is a continious linear stream of magnitized bits. By design, regardless of each individual sector’s physical length, each sector hold 512 bytes of data. One sector Read/Write Head

49. Hard Disk Controllers ST-506 Seagate Tech- nology 506 EIDE / IDE Integrated Device Electronics ESDI Enhanced System Device Interface SCSI SCSI-2 Small Computer System Interface 2 2 / 4 4 7 Controller # of Drives Transfer Avg. Access Type Supported Rate Time 5 Mbps 7.5 / 10 Mbps 10 Mbps 4 Mbps 10 Mbps 28 ms 10 / 8 ms 16 ms 14 ms

50. Congratulations! You are on your way!