How does a CD work? :: essays research papers

TABLE OF CONTENTSIntroduction ................................................................................................pg. 2Factors Creating the Demand For auxiliary Storage ............................pg. 2Why Buy Optical ........................................................................................pg. 3 CD Physical Characteristics.......................................................................pg. 4How Does a CD Work.................................................................................pg 5What is a CD-R............................................................................................pg 5What is CD-RW...........................................................................................pg 5How Does A CD-RW Work .......................................................................pg. 5Advantages of CD-RW ..............................................................................pg. 5video disc..................................... ........................................................................pg 6DVD VS. CD...............................................................................................pg 6Glossary ......................................................................................................pg 7Questions ....................................................................................................INTRODUCTION     The pulmonary tuberculosis of ocular fund continues to grow at an incredible pace. The word optic in the reckoner industry refers to any storage method which uses a laser to inventory and retrieve entropy from media. This term 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(a) terms such as rewritable optical, WORM, and CD-R, may be foreign. Rewritable optical devices use media that allows selective information to be written repeatedly , while WORM engineering science writes data permanently to disk. CD-R , pedigrees information permanently to a compact disc and is read on low-cost CD-ROM drives. These devices are currently sell as single or standalone items.The continuing development of optical technology has opened up many new avenues and created limitless possibilities. Migration software nowadays allows unused data to be moved from its original location to an optical device where it resides until it is needed. Since the only thing 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 variety of applications such as document timing, records retention, rilievo systems, and desktop publishing.FACTORS CREATING THE DEMAND FOR SECONDARY STORAGEBecause of its high capacity, low cost, durability, and hit-or-miss access to large amounts of profitsed information, secondary storage satisfies an essential need of data intensive or ganizations. This need for secondary 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 fair size of it of a stored document. Industry estimates indicate that the average document size has grown almost tenfold (PC Magazine, 03/10/98, "To Write or edict?")The information superhighway. The explosive growth of on line services, led by the Internet, has resulted in unprecedented use of such services to reach potentially huge new customer base.Another consideration for the need of rock-steady secondary storage is the increasing cost of managing storage on network servers. According to Strategic Research Corporation, as storage requirements explode, organizations are conclusion that the cost of managing the storage is almost four times the cost of the actual storage due to server downtime, backup procedures, and hard disk failures.