Illustrate about compact disk rewritable, Computer Engineering

Q. Illustrate about Compact Disk Rewritable?

CD-RW optical disk can be repeatedly written and overwritten same as with a magnetic disk. Even though a number of techniques have been tried but only pure optical approach which has proved attractive is known as phase change. Phase change disk uses a material which has two considerably different reflectivities in two different phase states. There is an amorphous state in that molecules display a random orientation and that reflects light poorly and a crystalline state that has a smooth surface which reflects light well. A beam of laser light can alter the material from one phase to other.  Primary shortcoming of phase change optical disks is that material ultimately and permanently loses its desirable properties. Current materials are able to be used for between 500000 and 1000000 erase cycles.

CDRW has obvious benefit over CD-ROM and CD-R that it is able to be rewritten and so used as a true secondary storage.  As it competes with magnetic disk. A key benefit of optical disk is that engineering tolerances for optical disks are much less severe than for high-capacity magnetic disks. So they exhibit higher reliability and longer life.

Posted Date: 7/19/2013 1:51:35 AM | Location : United States

Related Discussions:- Illustrate about compact disk rewritable, Assignment Help, Ask Question on Illustrate about compact disk rewritable, Get Answer, Expert's Help, Illustrate about compact disk rewritable Discussions

Write discussion on Illustrate about compact disk rewritable
Your posts are moderated
Related Questions
What is event-driven control? Control resides within a dispatcher or monitors that language, subsystem or OS provider. Developers attach application process to events and dispa

Q. Returns and Procedures definitions in 8086? 8086 microprocessor supports RET and CALL instructions for procedure call. CALL instruction not only branches to indicate address

a. Explain Intermediate Representation? What are the desirable properties of Intermediate Representation? b. Explain Grammar of a language. Identify the dissimilar classes of gr

Explain the characteristics of vector processing

In general, all public processes of a controller class are treated as action processes. If you require prevent this default behaviour, just decorate the public process with NonActi

Minimize the logic function F(A, B, C, D) = ∑ m(1,3,5,8,9,11,15) + d(2,13) using K-maps Ans. The logic function minimization of F(A, B, C, D) = ∑ m(1,3,5,8,9,11.15) + d(2,13) by

Consider a network message transfer among a source S and a destination D by 3 routers R1, R2 and R3 as given below:-               S -------- R1 --------- R2 --------- R3 ---

raster scan and random display technology

(a) Explain, using suitable examples, the functions of each of the sub system mentioned in the context of a large chain of supermarkets (i) Database Management Subsystem (ii)

How is the command Suppress-Dialog useful? Suppressing whole screens is possible using this command.  This command permits us to perform screen processing "in the background".