CD VS. DVD

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CD VS. DVD

• By Lindsey Medina
• ICS 101

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What is a CD?

• CD- CD stands for compact disc. A compact disc is
  a plastic disk approximately 12cm(4 in.) in
  diameter, on which information such as music or
  computer data is digitally encoded in a format
  readable by laser beam.

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Different Types of CDs

• CD-ROM- Stands for read-only memory. It is a type
  of optical disc that uses laser technology to
  store data, instructions, and information that
  users can read but, not write on or erase.
• For Example, manufacturers sell CD-ROMs with
  prerecorded audio, video and software, such as
  Dictionaries.

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Different Types of CDs Cont.

• CD-R- Stands for compact disc recordable. It is a
  multisession optical disc on which users can
  write, but not erase their own items such as
  text, graphics and audio.
• For example, this is the kind of disc you would
  use to record your own audio or to store
  downloaded music from web pages like
  www.apple.com/itunes/download/

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Different types of CDs Cont.

• CD-RW- Stands for compact disk-rewritable. It is
  a erasable multisession optical disc on which
  users can write data, instructions and
  information multiple times.
• For example, people usually use these disk as
  back up large files from a hard disk.

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What is a DVD?

• DVD- DVD stands for digital video disc or digital
  versatile disc. Stores data, instructions and
  information in a slightly different manner than a
  CD, so it achieves a higher capacity than a
  compact disc would.

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Different Types of DVDs

• DVD-ROM- Stands for digital versatile disc, read
  only memory. It is a high capacity optical disc
  on which users can read but not write or erase
  information. It is capable of storing 4.7 GB to
  17 GB of data.

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Different Types of DVDs Cont.

• DVD-R- Stands for digital video disc recordable.
  It is a disc that can be written on once and read
  many times. It has a capacity of 4.7GB .
• For example, many people use these disc to record
  movies downloaded from the internet.

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Comparing CDs and DVDs

• Today CDs are usually used to store audio for
  music purposes.
• They are also often used for computer software.

• DVDs are mostly used to record movies. Almost all
  movies are stored to DVDs as VHS is becoming a
  thing of the past.
• Someday DVDs will replace CDs because they have a
  higher storage capacity.

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Cost CDs Vs. DVDs
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Works Cited

• Cashman, Shelly, Vermaat.Discovering Computers
  2007, A Gateway to information. Boston,
  Massachusetts Thompson Course Technology, 2007.
• MSN Encarta.2007. Microsoft Corporation. 19 April
  2007. http//encarta.msn.com/encnet/features/dicti
  onary/DictionaryResults.aspx?refid1861694287