How does a CD work? :: essays research papers

TABLE OF circumscribeIntroduction ................................................................................................pg. 2Factors Creating the Demand For Secondary Storage ............................pg. 2 wherefore Buy Optical ........................................................................................pg. 3 CD Physical Characteristics.......................................................................pg. 4How Does a CD pee-pee.................................................................................pg 5What is a CD-R............................................................................................pg 5What is CD-RW...........................................................................................pg 5How Does A CD-RW Work .......................................................................pg. 5Advantages of CD-RW ..............................................................................pg. 5DVD............................. ................................................................................pg 6DVD VS. CD...............................................................................................pg 6Glossary ......................................................................................................pg 7Questions ....................................................................................................INTRODUCTION     The make use of of optical retentivity continues to grow at an unbelievable pace. The word optical in the computer industry refers to any repositing method which uses a laser to store and retrieve data from media. This precondition includes such devices as CD-ROM , rewritable optical, WORM, CD-R, and optical jukeboxes or autochangers.Most of us are familiar with CD-ROM, but other terms such as rewritable optical, WORM, and CD-R, may be foreign. Rewritable optical devices use media that allows data to be compose repeatedly, while WO RM technology writes data permanently to disk. CD-R , stores cultivation permanently to a compact disc and is read on affordable CD-ROM drives. These devices are currently sold as single or standalone items.The continuing development of optical technology has opened up some(prenominal) new avenues and created limitless possibilities. Migration software now allows unused data to be moved from its original location to an optical device where it resides until it is needed. Since the only issue that touches the media is the laser, it is the most durable way to store and archive data. Optical storage solutions are also used in a wide pastiche of applications such as document timing, records retention, backup systems, and desktop publishing.FACTORS CREATING THE DEMAND FOR utility(prenominal) STORAGEBecause of its high capacity, low cost, durability, and random access to large amounts of networked information, supplementary storage satisfies an essential need of data intensive organ izations. This need for secondary coil storage arises from a number of factorsDigital convergence. The move towards graphical user interfaces and the success of operating systems, such as Windows, Windows 95, and Windows NT, have resulted in a significant increase in the average size of a stored document. diligence estimates indicate that the average document size has grown almost decimal (PC Magazine, 03/10/98, "To Write or Rewrite?")The information superhighway. The explosive harvest-feast of on line services, led by the Internet, has resulted in unprecedented use of such services to reach potentially huge new node base.Another consideration for the need of reliable secondary storage is the increase cost of managing storage on network bonifaces. According to Strategic inquiry Corporation, as storage requirements explode, organizations are finding that the cost of managing the storage is almost four times the cost of the actual storage due to server downtime, backu p procedures, and hard disk failures.