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beam to read data. However, they are very different in internal structure and data capacity. In a DVD

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Англ с Информатик

beam to read data. However, they are very different in internal

structure and data capacity. In a DVD, the tracks are very close

together, thus allowing more tracks. The pits in which data is

stored are also smaller, so there are more pits per track. As a result,

a CD can hold 650–700MB, whereas a basic DVD can hold 4.7

GB. In addition, a DVD can be double-sided and dual layer, with

a capacity of 17 GB.

CDs come in three different formats:

– CD-ROMs (read-only memory) are read-only units,

meaning you cannot change the data stored on them (for example,

a dictionary or a game).

– CD-R (recordable) discs are write-once devices which let

you duplicate music CDs and other data CDs.

– CD-RW (rewritable) discs enable you to write onto them

many times, just like a hard disk.

– DVDs also come in several formats:

– DVD-ROMs are used in DVD computer drives. They al-

low for data archiving as well as interactive content (for example,

an encyclopedia or a movie).

– DVD-R or DVD+R can only be recorded on once.

– DVD-RW or DVD+RW discs can be erased and reused

many times. They are used to back up data ﬁles and to record au-

dio and video.

The DVD drive used in computers is also called a DVD burn-

er because it records information by burning via a laser to a blank

DVD disc.

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