CD and DVD ROM
The Data Container
Pre-pressed optical compact disc
A CD and DVD ROM are compact discs that contain data.
What was/is a CD used for?
When it was first made it was only used for sound, but it was later developed to store data.
Now some CD's can/ do contain more data than a computer, these CD's are worth over £1000!!!
In 2004 about 30 BILLION discs were made!!
How much data can they hold?
A usual CD can hold about 700 megabytes or 70 minutes of Audio.
A usual DVD can hold about 4.7 --> 8.5 Gigabytes.
What are they made of?
A CD is made of polycarbonate.
A DVD is made of plastic!
What does 'R' mean and 'RW' mean?
A DVD-R is a DVD that can be written once and read over and over.
A DVD-RW is a DVD that can be re-written.
What is a dual layer DVD?
A dual layer DVD is where a DVD has two layers and can hold more data than a usual DVD!
What is a CD you ask? - Ms Poopee Doodee Reports
Fixing Scratches in CDs and DVDs