1.3.5 Examples of Optical Storage

Question 1

Examples of Optical Storage - DVD

Answer 1

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

Question 2

Examples of Optical Storage - Blu-Ray Disks (BD)

Answer 2

Blu-Ray disks are often used to store high definition movies or games.
A single Blu-Ray disk can store around 25 GB of data.

Question 3

Examples of Optical Storage - Compact Disks (CD)

Answer 3

CDs are the original optical media standard.
A single CD can store around 700 MB of data.
CDs are very cheap to produce.

Question 4

Types of Optical Disk Re-Writable (RW)

Answer 4

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 5

Types of Optical Disk (ROM)

Answer 5

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 6

Types of Optical Disk Write-Once (R)

Answer 6

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.