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What is Disk Operating System (DOS)?

Here Information helps us to know about Disk Operating System.

What is Disk Operating System (DOS)?
It stands for Disk Operating System. It was designed in 1981 for IBM PC. It uses a command line interface, which means all commands are entered by typing from keyboard, there are no menus or graphical components. Hence, it does not need mouse. The file system of DOS (DISK OPERATING SYSTEM) can be understood as a tree structure where a drive contains many directories and files.
As shown in the above figure, C is a drive which has three directories - DOS, DATA and WP51.
DATA Directory has sub-directory OFFICE. It contains two files that is MEMO1.doc and MEMO.doc.
File- A file is a collection of information that you store on a disk. Each file stored in same directory must have a unique name. A file name has two parts the file name and extension separated by a dot. Here filename can be of maximum eight characters and extension of three characters.
For Example- myfile.txt, myfile is file name and txt is extension.
Directory- Directories are a collection of files. Every disk has one basic directory called the root directory. You can create directories in it and they will be called subdirectories.
Drive- A drive is a single alphabet representing any disk drive attached to computer. Each drive is represented as different letter. A and B are used for floppy disk drives. C is used for hard disk. Other partitions and disk drives can be named as D, E, F and so on.
Pathname- A pathname is a sequence of drive, directory names followed by a file name which shows exact location of a file. 
For example: C:\Mydir\myfile.txt - shows that the file myfile.txt is located in Mydir directory on drive C.
Command- A command is the name of a special program that makes your computer carry out a task. Every command in DOS is given by typing in through keyboard, at a drive prompt.
By default C prompt (C:\>) is on the screen. The commands in DOS are of two categories:
  1. Internal commands- these are built into the operating system as part of a file called COMMAND.COM. They are loaded into memory during the booting process.
  2. External commands- They are not built into the operating system, rather are stored as separate files.

What is Disk Operating System
tree structure
Internal and External Command
Windows Operating System- DISK OPERATING SYSTEM (DOS)
Tech writer at NewsandStory
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