Optical

Question 1

How does Optical Storage store data

Answer 1

Each 1 or 0 (value of a bit) is represented as a microscopic hole (called a pit) or a flat surface (called a land) on the surface of the disk.

Question 2

How does Optical access data

Answer 2

A laser is shone on the disk surface.
If the laser hits a land, it will be reflected into a sensor.
If the laser hits a pit, then it will be reflected elsewhere.
These can be used to represent our 1 and 0.

Question 3

Properties of Optical Media

Answer 3

Low cost
Good Capacity
Low speed
Great reliability

Question 4

DVD

Answer 4

used to store games or standard-definition movies for home viewing.
A single DVD can store around 4.7 GB of data.

Question 5

Blu-Ray

Answer 5

used to store games or standard-definition movies for home viewing.
A single DVD can store around 4.7 GB of data.

Question 6

CD

Answer 6

used to store games or standard-definition movies for home viewing.
A single DVD can store around 4.7 GB of data.

Question 7

Re-Writable

Answer 7

A CD-RW, DVD-RW, or BD-RW is a disk which can be overwritten whenever the user would like to.
These are often used for backups which might need to be updated in the future.

Question 8

Read Only

Answer 8

A CD-ROM, DVD-ROM, or BD-ROM is a disk which can be read only.
The manufacturer writes the initial data, and this cannot be changed.
This is often used in content distribution so that people cannot accidentally overwrite the content.

Question 9

Write once

Answer 9

A CD-R, DVD-R, or BD-R is a disk which can be written once by the user at home.
Once the user has written data to the disk, they cannot overwrite it.