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What is the Disk operating system on a computer?

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Introduction

DOS is an Operating system. It works as an interpreter. We give English like commands and it converts it into machine language and after processing the information, returns the results to you in English. MS-DOS consists of four essential programs and set additional utilities. Components of MS-DOS consist of essentials programs and set of additional utilities. For main programs are boot Record, IO.SYS, and COMMAND.COM.

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Internal Commands

Their commands are also called memory-resident and these are automatically loaded into the computer's memory during the booting process. They are actually included in the command.com file. So these commands are executable immediately after getting the dos prompt.

External Commands

These Commands are called DIsk-Resident Commands. These Commands are meant for a special purpose. These are found in separate files on Hard Disk or Floppy Disk so that they don't typically consume valuable memory space. They are loaded into memory only when called.

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Formatting a Diskette

Be sure you only format floppies or Removable drives! Never format your C: drive when doing these lessons else you will lose everything on your hard drive!! You use the FORMAT command to format a diskette. We did that in our previous lesson.

Types of Files

A file has two parts; first is the name of files and the second is an extension of files. Name is an option and usually given by the user but sometime it may use with the default name. but extension defines the file type.

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Folder

A folder is a place or container which is used to store or contain files. A folder an icons picture in default but you can even change the icon of a folder. A folder has no its own size. It is measured with the size of its own files contained inside. A folder is created by a user or by a system, for example, a folder you create at the desktop or anywhere else in the computer is called user-defined folder or icon whereas a folder which comes automatically when the operating system is installed or configured like my computer, Recycle Bin, My Documents etc.

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