What is compact disk rom, Computer Engineering

Assignment Help:

Q. What is Compact Disk ROM?

Both audio CD and CD-ROM (compact disk read-only memory) share similar technology. Main difference is that CD-ROM players are more rugged and have error correction devices to ensure that data are appropriately transferred from disk to computer. Both types of disk are made the same way. Disk is created from a resin like polycarbonate. Digitally recorded information (either music or computer data) is imprinted as a sequence of microscopic pits on surface of polycarbonate. After that Pitted surface is coated with a highly reflective surface frequently aluminium. Shiny surface is protected against scratches and dust by a topcoat of clear acrylic. Lastly a label can be silk-screened on acrylic.

 

1220_What is Compact Disk ROM.png

Figure: The CD Surface and Operation

Information is retrieved from a CD or CD-ROM by a low-powered laser housed in an optical-disk player or a drive unit. The laser shines via clear polycarbonate whereas a motor spins disk past it (Figure above). Intensity of reflected light of laser alters as it encounters a pit. Specially if laser beam falls on a pit light scatters and a low intensity is reflected back to source.  Areas between pits are termed as lands. A land is a flat surface that reflects back at a higher intensity. Change between lands and pits is detected by photo sensor and converted in a digital signal. Sensor tests surface at regular intervals. Beginning or end of a pit signifies a 1 when no change in elevation takes place between intervals then a 0 is recorded. Data on CD-ROM are arranged like sequence of blocks.


Related Discussions:- What is compact disk rom

Differentiate between rom test and the ram test, Probelm : a) What is t...

Probelm : a) What is the purpose of "Jumps" in the 8051 Microcontroller? Describe three types of "Jumps". b) What is the purpose of a "call"? c) Differentiate between ROM

Define the message queues, The message queue provides the information about...

The message queue provides the information about sizes of queues under utilization of various processors. It points to size of every processor incoming message queue that would be

Explain about mainframes computer, Q. Explain about Mainframes computer? ...

Q. Explain about Mainframes computer? Mainframes, capable of executing in excess of 53 MIPS, are high-performance, general- purpose computers supporting very large databases, r

Specifying the problem - learning decision trees, Specifying the Problem: ...

Specifying the Problem: Now next here furtherly we now use to look at how you mentally constructed your decision tree where deciding what to do at the weekend. But if one way

Serial execution and parallel execution, Serial Execution Execution of ...

Serial Execution Execution of a program consecutively, one statement at a time. In the easiest sense, this is what occurs on a one processor machine. However, even many of the

Explain definition of fibonacci, Explain definition of fibonacci Where ...

Explain definition of fibonacci Where an input value gives a trivial result, it is returned directly, otherwise the function calls itself, passing a changed version of the inpu

Rank the list elements in terms of distance, Q. Rank the list elements in t...

Q. Rank the list elements in terms of distance? Rank the list elements in terms of distance from each to last element in given linear linked list. A parallel algorithm for t

Explain the meaning of connect socket primitive, Explain the meaning of ...

Explain the meaning of CONNECT socket primitive. The connect Primitive: Clients utilize procedure connect to establish connection with an exact server. The form is

Handling a page in memory - computer architecture, Handling a Page: ...

Handling a Page: Typical page size today are 4 kb to 16 kb ,having tendency to use even larger page sized Organization that reduce the page fault rate are striking (comp

What is an interrupt, What is an interrupt?  An interrupt is an event t...

What is an interrupt?  An interrupt is an event that causes the implementation of one program to be suspended and another program to be implemented.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd