I describe one type of secondary devices is Compact Disc in detail

Compact disc,or as it is better known CD,was the most widely used optical format.CD drives were standard on many microcomputer systems.Typically,CD drives can store from 650 megabytes to 1 gigabyte of data on one side of a CD.

There are three basic types of CDs:read only,write once,and rewritable:

Read only-CD-ROM,which stands for compact disc-read-only memory,is similar to a commercial music CD.Read only means it cannot be written on or erased by the user.Thus,you as a user have access only to the data imprinted by the publisher.CD-ROMs are used to distribute large databases and references.They also are used to distribute large siftware application packages.

Write once-CD-R,which stands for CD-recordable,can be written to once.After that they can be read many times without deterioration but cannot be written on or erased.CD-R drives often are used to archive data and to record music downloaded from the Internet.

Rewritable-CD-RW stands for compact disc rewritable.Also known as erasable optical discs,these discs are very similar to CD-Rs except that the disc surface is not permanently altered when data is recorded.Because they can be changed,CD-RWs are often used to create and edit multimedia presentations.

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