1. Storage and Multimedia

2. Optical Storage Devices
Most widely used and reliable storage devices
Use laser technology to store data and read data to and from the disk
Most popular storage devices are:
CD-ROM drive
DVD-ROM drive
CD-Recordable drive
CD Re-Writeable Drive
Some optical storage media is read-only while others are read and write

3. Optical Storage Devices
An optical storage media consists flat, round, portable metal disc, which is coated with a thin metal or plastic or other material that is highly reflective
These discs are usually 0.75 inches in diameter and less than one-twentieth of an inch thick
The information on the optical disk is stored in the form of pits and lands

4. Optical Storage Devices

5. CD-ROM Stands for Compact Disc Read-Only Memory
Uses laser technology to store and to read data to and from the disc
Once the information is stored, it becomes permanent and cannot be changed
Information can be read only for processing
That’s why it is called read only memory
CD-ROM drive used with computer to read the information from the CD-ROM

6. DVD-ROM Digital Video Disc or Digital Versatile disc
Extremely high capacity storage disc with storage capacity from 4.7 GB to 17GB
Latest generation of DVD-ROM disks actually layers of data tracks
Reads the data from the first layer, and then look through it to read data from the second layer and so on

7. CD-R CD-R stands for Compact Disc Recordable
It is a blank disc that is used to store the information
Also write the data on the optical disc
The process of writing the data on the optical disc is called burning
Functionally equivalent to pre-recorded CD-ROM

8. CD-Writer A CD-Writer or recorder is used to write data on CD-R Disks
Read the information from CD as well as write information on CD
More expensive than ordinary CD-ROM drives

9. CD-RW & CD-RW Drive Stands for Compact disc Rewritable
New generation of optical disc
Erasable disc
Can write and overwrite the data on the CD-RW disc many times
Acts like floppy and hard disk
Reliability of the disc tends to decrease, each time you rewrite the data
CD-RW drive is used to write the data on the CD- RW

10. Mobile Storage Devices
Online Storage
Smart Cards
Flash Memory Devices

11. Multimedia
Multimedia refers to the application in which text, graphics, animation, audio and video effects are integrated to provide a completely interactive interface through a computer system
User gives input through a variety of input devices and takes output also through a variety of output devices
Main uses of multimedia applications are in video games, computer based training

12. Advantages
Allow the computer user to communicate with the computer system
Gives a real world impression
Communicate with people in remote location
Do not need to convert data into computer acceptable form
Student and trainees find it easy to understand
Can be connected to other machines and electronic devices
People get attraction towards computer learning
Use of computer product increase in business environment

13. Disadvantages Overall cost of computer increases
Computer user must be well trained
Sometimes overall performance of computer slows down
A proper maintenance is must
Sometimes if any of the attached device gets out of order, all the system stops it working
Remote connection must be reliable and fast

14. Multimedia Applications
Business Presentation
Computer Based Training
Electronic Books
Entertainment

15. References
Introduction to Information Technology by Riaz Shahid, CM Aslam and Safia Iftikhar
The Concepts of Information Technology by Imran Saeed, Ahsan Raza, Tariq Mehmood and Zafar Hussain