CDsAndDVDs.Abstract History

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A compact disc is known by its acronym: a CD, which is a polycarbonate with one or more embedded metal layers capable of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer data. Both of these types of compact disc are read-only, which means that once the data has been recorded onto them, they can only be read, or played.

A digital versatile
disc or digital video disc is known by its acronym: a DVD, which , is a type of optical disk technology similar to the CD-ROM. A DVD holds a minimum of 4.7GB of data and a maximum of 17.1GB of data, which is enough to store a full-length movie and other multimedia presentations that combine sound with graphics.
The DVD specification supports disks with capacities of from 4.7GB to 17GB and access rates of 600KBps to 1.3 MBps. One
of the best features of DVD drives is that they are backward-compatible with CD-ROMs, meaning they can play old CD-ROMs, CD-I disks, and video CDs, as well as new DVD-ROMs. Newer DVD players can also read CD-R disks.
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Both CDs (compact discs) and DVDs (digital versatile discs or digital video discs) are specialized media that store digital information. The most common and inexpensive forms of CDs and DVDs available are read-only in that once data is written onto them, it can only be read back and can not be modified
. However, one can easily find write-once discs as well as discs that allow for writing and erasing multiple times. The physical storage principle is to create patterns in the disc material with different reflectivity --- this then modifies the reflection of a laser beam that scans across the surface.

A CD is made of polycarbonate with one or more embedded metal layers capable
of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer. Typical CDs can store about 700 MB (megabytes) of information. This is sufficient for roughly an hour or two of music (stored in uncompressed form).

A
DVD is similar to the a CD but with a much higher storage density. A DVD holds a minimum of 4.7GB of data and a maximum of 17.1GB of data, which is enough to store a full-length movie and other multimedia presentations that combine sound with graphics. One of the best features of DVD drives is that they are backward-compatible with CD-ROMs, meaning they can play old CD-ROMs, CD-I disks, and video CDs, as well as new DVD-ROMs. Newer DVD players can also read CD-R disks.
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DVD uses MPEG-2 to compress video data.

For comparison and contrast, see DVD-R, DVD-RW, DVD+R, DVD+RW and DVD-RAM.
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%rframe width=150px% Attach:DVD001.jpg | '''View of a DVD or Digital Versatile Disc'''
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%rframe width=150px% Attach:DVD001.jpg | '''Partial View of a DVD or Digital Versatile Disc'''
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%rframe width=150px% Attach:CD001.jpg | '''View of a CD or Compact Disc'''
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%rframe width=150px% Attach:DVD001.jpg | '''View of a DVD or Digital Versatile Disc'''
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%rframe width=150px% Attach:CD001.jpg | '''View of a CD or Compact Disc'''
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%rframe width=150px% Attach:HardDrive.jpg | '''Internal View of a Hard Drive'''
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%rframe width=150px% Attach:CD001.jpg | '''View of a CD or Compact Disc'''
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%rframe width=150px% Attach:HardDrive.jpg | '''Internal View of a Hard Drive'''
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Known by its abbreviation, CD, a compact disc is a polycarbonate with one or more metal layers capable of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer data. Both of these types of compact disc are read-only, which means that once the data has been recorded onto them, they can only be read, or played.

Short for digital versatile disc or digital video disc, a type of optical disk technology similar to the CD-ROM. A DVD holds
a minimum of 4.7GB of data, enough for a full-length movie. DVDs are commonly used as a medium for digital representation of movies and other multimedia presentations that combine sound with graphics.
to:
A compact disc is known by its acronym: a CD, which is a polycarbonate with one or more embedded metal layers capable of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer data. Both of these types of compact disc are read-only, which means that once the data has been recorded onto them, they can only be read, or played.

A digital versatile disc or digital video disc is known by its acronym:
a DVD, which , is a type of optical disk technology similar to the CD-ROM. A DVD holds a minimum of 4.7GB of data and a maximum of 17.1GB of data, which is enough to store a full-length movie and other multimedia presentations that combine sound with graphics.
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Abstract
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Abstract

Known by its abbreviation, CD, a compact disc is a polycarbonate with one or more metal layers capable of storing digital information. The most prevalent types of compact discs are those used by the music industry to store digital recordings and CD-ROMs used to store computer data. Both of these types of compact disc are read-only, which means that once the data has been recorded onto them, they can only be read, or played.

Short for digital versatile disc or digital video disc, a type of optical disk technology similar to the CD-ROM. A DVD holds a minimum of 4.7GB of data, enough for a full-length movie. DVDs are commonly used as a medium for digital representation of movies and other multimedia presentations that combine sound with graphics.
The DVD specification supports disks with capacities of from 4.7GB to 17GB and access rates of 600KBps to 1.3 MBps. One of the best features of DVD drives is that they are backward-compatible with CD-ROMs, meaning they can play old CD-ROMs, CD-I disks, and video CDs, as well as new DVD-ROMs. Newer DVD players can also read CD-R disks.

DVD uses MPEG-2 to compress video data.

For comparison and contrast, see DVD-R, DVD-RW, DVD+R, DVD+RW and DVD-RAM.