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Thursday, July 18, 2013

Explain Differences Between CD and DVD

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 What is CD?

CD stands for Compact Disc. Compact Disk or CD is a popular storage device. It is a portable storage device. It can store about 700 MB (Mega Bytes) of data.

Advantages of Compact Disk

  • It can store large amounts of different types of data. It can store information in the form of sound, videos, programs or software, pictures and other graphics, documents and many more formats of data.
  • We purchase games and software stored on CDs. CD can store audio/ video songs and videos, too.
  • It is very inexpensive way of storing large amounts of data permanently.
  • It is used for backing up of important data, that can be recovered in future if any data is lost from our PC's hard disk.
  • Compact Disks are easy to use and easy to carry.
  • Compact Disks are durable and reliable. CDs can store data for many years without losing a single byte.

Different Types of Compact CDs are:

CD-ROM (Compact Disk Read Only Memory)

CD-ROM comes with already stored data on it, like games or software. As the name CD-ROM says, data can not be deleted or edited on CD-ROM. We can only read or copy data from CD-ROM.

CD-R (Compact Disk Recordable)

Compact Disc Recordable is a blank disk. We can store data on it with the help of CD-Writer only once. Then it becomes CD-ROM. So, we can only read data. We cannot change or delete data.

CD-RW ( Compact Disk Rewritable)

CD-RW disk is more useful type of Compact Disk. We can write data on CD-RW many times. We can read data, write data, erase data and rewrite data on CD-RW for many times.

What is DVD?

DVD stands for Digital Video Disk or Digital Versatile Disk. The basic difference between CD and DVD is that DVD has much more data storage capacity. DVD can store data up to 17 GB (Giga Bytes).

Advantages of DVD


  • DVD can store much more larger amounts of different types of data as compared to CD. It is used to store HD movies. It can store information in the form of sound, videos, programs or software, pictures and other graphics, documents and many more formats of data.
  • We purchase high quality movies, games and software stored on DVDs.
  • It is very inexpensive way of storing large amounts of data permanently. Although it is more expensive than CD but it can store much more data.
  • It is used for backing up of important data, that can be recovered in future if any data is lost from our PC's hard disk.
  • DVDs are easy to use and easy to carry.
  • DVDs are durable and reliable. DVDs can store data for many years without losing a single byte.

Different Types of DVDs are:

DVD-ROM (Digital Video Disk Read Only Memory)

DVD-ROM comes with already stored data on it, like movies, games or software. As the name DVD-ROM says, data can not be deleted or edited on DVD-ROM. We can only read or copy data from DVD-ROM.

DVD-R (Digital Video Disk Recordable)

Digital Video Disc Recordable is a blank disk. We can store data on it with the help of DVD-Writer only once. Then it becomes DVD-ROM. So, we can only read data. We cannot change or delete data.

DVD-RW ( Digital Video Disk Rewritable)

DVD-RW disk is more useful type of DVD. We can write data on DVD-RW many times. We can read data, write data, erase data and rewrite data on DVD-RW for many times.

Here we tabulate the main differences between CD and DVD.


Sr. No
CD
DVD
1
It stands for Compact Disk
It stands for Diital Video Disk or Digital Versatile Disk.
2
CD can store about 700 MB of data. So, data storage capacity is much smaller than that of DVD.
DVD can store about 17 GB data. Therefore, data storage capacity is much larger than that of CD.
3
Technology to read/write on CD uses a laser beam of larger wave length that makes larger pits (tiny holes) on CD. Each pit represents a binary 1.
Technology to read/write on DVD uses a laser beam of shorter wave length that makes smaller pits (tiny holes) on DVD. Each pit represents a binary 1. Therefore, there will be more pits on DVD surface than that of CD. So there will be more data storage capacity of DVD than that of CD.
4
CD is cheaper than DVD.
DVD is more expensive than CD.
5
CD has slower data transfer rates.
DVD has faster data transfer rates.
6
Different types of CD include: CD-ROM, CD-R and CD-RW.
Different Types of DVD are: DVD-ROM, DVD-R and DVD-RW.


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