Operating system by hm

 WHAT IS OPERATING SYSTEM?
operating system is a set of program
which controls and maintains the
computer.
operating system is a software, which
makes a computer to actually work.
It provides a pleasant and effective
interface between the user and the
hardware

 FEATURES OF OS
 Reliable
 Operational at all times
 Should coordinate and have good
control of I/O operations and the
devices on which they are
performed.
 Enhance time sharing.

 STRUCTURE OF OS
Make a computer system easier to use :-
 OS hides details of hardware resources from
programmers and other users .
 It provides the convenient interface to the
programmer for using a computer system.
Manage the resource of computer system:-
 OS manages all the resource of a computer system .
 Efficient and fair sharing of a system resources
among users and programs.

STRUCTURE OF OS
Computer
system
Users
Other
system
Operating
system

FUNCTIONS OF OS
PROCESS
MANAGE
MENT
MEMORY
MANAGEMENT
FILE
MANAGE
MENT
SECURITY
MANAGE
MENT
COMUNICA
TION
MANAGEM
ENT

1. PROCESS MANAGEMENT
 By process management OS manages many
kinds of activities: -
 All process from start to shut down
 Save
 Copy
 Print
 Booting
 Send ,etc.

2. MEMORY MANAGEMENT
 The major activities of an operating regard to
memory management are:-
 Decide which process are loaded into
memory when memory space becomes
available.
 Primary RAM-ROM.
 Secondary –Hard Disc ,CD,DVD etc.

3. FILE MANAGEMENT
 The file management system allows the user to
perform such tasks:-
 Creating files and directories
 Renaming files
 Coping and moving files
 Deleting files

4. SECURITY MANAGEMENT
 By security management OS manages many tasks
such as:-
 Alert messages
 Dialogue boxes
 Firewall
 Passwords
 Virus management

5.COMMUNICATION MANAGEMENT
 User-Application S/W-Hardware.
 One computer to other computer in
LAN/WAN.
 Command interpretation.
 Downloading-Uploading.

 ADVANTAGES OF OS
 Easy to use
 User friendly
 Intermediate between all hardware’s
and software’s of the system
 No need to know any technical
languages
 It’s the platform of all programs

POPULAR OPERATING SYSTEM
There are two
most popular
operating
system as:-
SINGLE
USER
SYSTEMS
MULTI USER
SYSTEMS

 SINGLE USER SYSTEM
They are popular associated
with desk top operating
system which run on
standalone system where no
user accounts are required.
Example: DOS

 MULTI USER SYSTEMS
Provides regulated access for
a number of users by
maintaining a database of
known users. Refers to
computer systems that support
two or more simultaneous
users.
Example: Unix,Linux,Microsoft
windows etc.

 OS FOR MOBILE DEVICES
Operating system were designed to run on desktop
or laptop computers
Mobile devices such as PHONES,TABLET
COMPUTERS, and MP3 PLAYERS.
Operating systems for mobile devices generally
aren’t as fully featured as those made for desktop
and laptop PC’s.

DISADVANTAGES OF OS
If any problems affected in OS, you
may lose all the contents which have
been stored already
Unwanted user can use your own
system

Operating system by hm

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