Optical Disk Drive Quiz

Optical discs are things like CDs, ___s and Blu-Rays.

CDs can hold around 700 MB of data.

DVDs can hold around 4.7 GB of data.

Blu-Rays can hold around 25 GB.

Optical discs are things like CDs, DVDs and Blu-Rays.

CDs can hold around ___ MB of data.

DVDs can hold around 4.7 GB of data.

Blu-Rays can hold around 25 GB.

Optical Discs come in three forms, select all of them...

Rewriteable (CD-RW, DVD-RW etc)

• Read-Only (CD-ROM / DVD-ROM etc)

• Write Only (DVD-R / BD-R)

• Rewriteable (CD-RW, DVD-RW etc)

• Retweetable (CD-Tweet / R)

Nowadays Optical Disk storage use is declining in society due to which two factors...

• Streaming and download services have reduced the need for optical disks.

• They have lots of moving parts and thus create heat.

• Lots of modern devices don't even have a optical disk drive so cannot accept data from these types of secondary storage devices.

• They are not easily portable

Data is stored (written) as pits and lands (flat spots) burnt into a spiral track circulating outwards from the centre of the optical disk by a laser.

• True

• False

Data is stored (written) as magnetized 1s and 0s burnt into a spiral track circulating outwards from the centre of the optical disk by a laser.

• True

• False

To read an optical disk...

A laser beam passes over the pits and lands, the level of reflection is measured. From this signal, 0s and 1s can be derived from reflections (1s) or no reflections (0s)

• True

• False

This image shows the surface of a optical disk.

The first arrow should be labelled as ?

This image shows the surface of a optical disk.

The 2nd arrow (further right) should be labelled as ?

Select ALL the Advantages of Optical Disk over other storage devices (HDD, SSD and USB).

• Very Cheap, 

• Less storage capacity compared to HDD/SSD

• Very easily portable

• Easily damaged / scratched, requires a CD reader