Operating System

Operating System

1. CONCEPT

   • It's a software
   • Works as an interface between
     • User
     • Computer Hardware

2. FUNCTIONS

   • Manage Hardware and Software Resourches
     • Resource Manager
       • Memory
       • Processor
       • I/O Devices
     • Storage Management
       • Directories
       • Files
   • Provides an Application Program Interface - API
   • Process Management
   • Memory Management
   • Extended Machine
   • Mastermind

3. TYPES

   • Serial Processing
     • FIFO
   • Batch Processing
   • Multi - Programming
   • Real Time System
   • Distributed Operating System
   • Multiprocessing
   • Parallel Operating System

4. EXAMPLES

   • MS-DOS
   • MS-WINDOW - 98/XP/VISTA
   • OS/2
   • WINDOWS-NT/2000
   • UNIX
   • MAC/OS
   • UBUNTU

5. STRUCTURE

   • Kernel
     • Monolitich
     • MicroKernels
   • Shell
   • User Interface
   • File Management System
   • Memory Management
   • Task Management
   • I/O Management
   • User Applications Programs

6. CHARACTERISTICS

   • Collection of Programs
   • Controll all I/O Devices
   • Run all the Application Softwares
   • Allocates the Memory to various Process those Wants to Execute
   • Provides the Communication between the user and the System
   • Stored into the BIOS
     • Floppy
     • Hard Disk

7. ADVANTAGES

   • Hide details of Hardware
   • Provides GUI
     • Permits execute programs/applications
   • Convenient to use
   • Intermediary among applications and the hardware components
   • Provides the Computer System Resources with a simply to use format
   • Intermediator between all hardware's and software's of the system

8. DISADVANTAGES

   • If any issue occures in OS, you may lose all the contents which have been stored in your system
   • Expensive for small size organization which adds burden on them
   • Never entirely secure