CD

DVD

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Optical Storage Devices

Definition : CD Read Only Memory/DVD Read Only Memory

This means when we buy it, it has some data already installed on it and we can’t remove that data. We can read it, but can’t save on it

Examples are: Musical CD, Film DVD Advantage It has a lot of memory on itDisadvantage A data can be installed on it one time only

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Optical Storage Devices

An empty CD/DVD diskAdvantages It is small and portable. It is very cheap to produce. Fairly fast to access data.

Disadvantages Data can be stored 1 time only. It is easy to break or scratched.

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Optical Storage Devices

Advantages It has enough memory in it. The data can be stored as much time as you want. It is small and portable. Fairly fast to access data.

Disadvantages DVDs do not work in CD drives. There is no single standard of DVD. They can be easily damaged by breaking or scratching.

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Optical Storage Devices

DVD Random-Access Memory

Advantages Long life (about 30 years without

damaging). Can be rewritten about 100000 times. Has write-protect tabs to prevent

accidental deletion when used in a cartridge.

Disadvantages Less compatibility than DVD+RW and

DVD-RW, despite predating both formats (as noted above).

DVD-RAM media is more expensive than other types of DVD.

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Optical Storage Devices

High Definition/Density DVD

Advantages Cheap considering the picture

quality produced by HD-DVD and the list of movie studios.

Sounds good. Backwards compatibility included.

Disadvantages Xbox 360 version features no

HDMI. Films are not cheap.

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Optical Storage Devices

Advantages Huge storage capacity. Backwards compatibility. Keep on burning. Quality support.

Disadvantages High cost.

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Optical Storage Devices

Advantages Smallest form of memory, used as removable storage. More robust than other forms of storage. Can be easily written to and updated. Small and comfortable.

Disadvantages More expensive than other forms. Easy to lost.

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Optical Storage Devices

Advantages Used to transport files and

backup data from computer to computer.

Can store up to a lot of Gigabytes.

Disadvantages Can be easily lost.

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Optical Storage Devices

Advantages They are compact and portable. They hold a lot of data. They are reliable.

Disadvantages At the moment, the cost per

megabyte of storage is more expensive than floppy disks, CDs or DVDs.

They can be easily lost. The metal part which is inserted into

the USB port can be snapped off if they are handled roughly .

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