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Disk operating system


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this presnted by Rizwan Federal Board IN PAKISTAN

Published in: Education

Disk operating system

  1. 1. Disk Operating System PRESENTED BY RIZWAN AKRAM
  2. 2. What is Dos? DOS stands for Disk Operating System. DOS (Disk Operating System) was the first widely-installed operating system for personal computers.  DOS controls the computer’s hardware and provides an environment for programs to run.  This system program must always be present when working with your computer.
  3. 3. Dos is a single user operating system. Single user operating system is most popular in microcomputer upto mid of 1990s.It is also called DOS because it is store on a disk of a computer.
  4. 4. Major Task Of a DOS The major tasks the DOS must carry out are:-  To control input and output devices.  To enable user to load and execute program.  To maintain an orderly system of data on the disk.
  5. 5. DOS Files DOS has three important or special files are :- BAT (batch files) COM (command files) EXE (executable files)
  6. 6. DOS Commands DOS consist of a series of a program designed to control the computer resources. DOS commands have three parts: File name, parameters, switches. Mostly these commands consist of regular English word like words.  For example ERASE,COPY,DEL,PRINT etc.
  7. 7. Types of DOS Commands  There are two types of DOS commands. DOS Internal Commands. DOS External Commands.
  8. 8. DOS Internal Commands DOS internal commands are stored in the COMMAND.COM file. DOS internal command are loaded automatically into the memory (RAM) when you start your systems. These includes the simpler and common commands that are needed on regular basis.  Internal commands are the part of COMMAND.COM
  9. 9. Some DOS Internal Commands  Some DOS internal command are:-  CLS – CLS command is use for clear the screen.  VER – Display the DOS version number.  VOL –Displays the volume label and serial  TYPE –Display the contents of a text.  Exit –Exit the command processor (COMMAND.COM Program).
  10. 10. DOS External Commands  Second type of DOS Commands is External command. DOS External Command required less frequently.  These are reside on disk.  Loaded automatically into memory (RAM) only when needed.
  11. 11. Some DOS External Commands  Some DOS External Commands are:- CHKDSK – Check the validity of disk and reports the total space, number of files and amount of free space. COMP – Compare the content of two sets of files. COMMAND – Starts the command processor. SYS –Creates a bootable drive.
  12. 12. THANK YOU