CDs and DVDs: The Tool

The CD-ROM should be considered mandatory on any computer that is built now, because most software is distributed on CD-ROM. Today, although still used, are beginning to fall into disuse since they began to be replaced by DVD drives. This is mainly due to the greater possibilities of information, since a DVD-ROM capacity exceeds one CD-ROM.

But who are the CD and DVD?

A CD-ROM (English abbreviation of Compact Disc - Read Only Memory, "Compact Disc - Read Only Memory") is a compact disc used to store non-volatile information. The CD is a flat plastic disc with digital information encoded in a spiral from the center to the edge exterior.Un standard CD can hold 650 or 700 MB of data. The CD is popular for distribution of software, especially multimedia applications, large databases and weighing only 30 instead gramos.Un DVD are divided into two categories: single layer and dual layer blank DVD capa.Los simple can store up to 4.7 gigabytes, about twelve times more than a CD estándar.El DVD uses a more efficient coding method in the physical layer: the detection and error correction used in CD, such as redundancy check CRC cyclical.

Now computer users want to keep your own information and that's where the CD Virgin born and DVDs.

And I made using the corresponding recorders or burners, either CD or DVD.

A CD drive is an electronic device that allows the reading of these records by using a beam of a laser beam and the subsequent transformation into the computer interprets impulsoseléctricos. These discs are written by CD recorders on the CD-R (blank CD) with the difference that makes the reader otherwise, ie, transform electrical impulses in a laser beam on the CD stored as binary data wells and plains. The same happens with the DVD burner but in this case are DVD-R.

We can also find other CDs and DVDs category regrabables.A Unlike CD-R, CD-RW discs can be erased itself, or even formatted (can use the disk, losing part of its capacity, but gives the new files). In the case of using a CD-RW when we delete, erase it completely, you can also do partial deletions that need a higher power laser to burn. A CD-RW can be used as a floppy disk, with appropriate software, provided that the drive supports this feature, you can manipulate files as a floppy disk, with the exception that is not erased, but that deleting a file that is occupying a space on the disk, but does not appear to examine the file. CD-RW discs require more laser power to record, for this reason rewritable discs have a recording speed lower than the discs (take longer to finish recording).

Cleaning and storing CDs and DVDs virgin virgin

For the disk to store all data in full, and for a very long time, it is necessary to keep the disc in the packaging or places correctos.La reflective part of the disk must be clean and free of scratches, to avoid loss of datos.Es advisable to transfer data from one or eroded old disk to another disk clean or new, before they lose all the data with the tiempo.Sólo is recommended to clean the disc if it is very dirty and appear leaps image and / or sound lectura.Ya or errors that error correction systems can read data through a moderate amount of scratches and / or fingerprints.