A compact disc is made of three thin layers - a tough plastic middle layer, with a thin aluminum layer in between and a protective lacquer layer on top. This layered structure makes the disc shiny on one side to reflect a laser that reads the information stored on the disc. Compact discs are commonly used for storing large files like movies, music, games and software by educational institutions, advertisers and musicians due to their mass storage capacity. However, CDs are easily breakable, require a special drive to read and write, and can be expensive.

1. Storage device
Compact Disc “CD”
H00271567
MAITHA ALMUHAIRI

2. WHAT IS CD?
A compact disc is a thin, disc of metal and plastic, It's actually made of
three layers. Most of a CD is made from a tough, brittle plastic
middle there is a thin layer of aluminum. Finally, on top of the
aluminum, is a protective layer of lacquer.

3. Why its shiny ?
There is two side for CDs
#Shiny
that a laser can bounce off the disc and read the information stored it
#Dull
To know what is the CDs for by putting the label .

4. Uses for the CDS
• CDs tend to be used for large files
- Advertising
- Educational Institutions
- CD for bands and musicians
- CD for movies
- CD for gaming

5. How it work
• https://www.youtube.com/watch?v=uwYcnLDApsQ

6. Advantage
• Mass storage capacity
• uncountable storage units
• High data stability
DISADVANTAGE
• Easily broken
• They require special drive to read and
write.
• It is expensive

7. Reference
• http://www.discwizards.com/articles/What-can-a-CD-be-used-
for.htm
• http://www.explainthatstuff.com/cdplayers.html
• http://storage-devices.weebly.com/advantagesdisadvantages.html