The most advanced DVD players can play a wide range of units, except DVD. The DVD player can play DVD-RAM, DVD-R, DVD-RW, DVD + R, DVD + RW, CD Audio, CD-R, CD-RW, MP3, WMA, JPEG, MPEG 4, VCR, Picture CD, SVCD, and DivX DVCD. This DVD player with features and a wide price range. Manufacturers of DVD players decide "what kind of functions and take the type of disks that are supported, taking into account consumer needs and convenience.
Region free DVD players are usually developed in order to read discs all different and therefore higher prices on the market. They are widespread throughout the Region 2 countries, including Britain, France, Italy, Greece and Spain. In these countries it is legal to possess and use region free DVD players if used for non commercial purposes.
CD-R
There are two types of CD, CD-R and CD-RW. CD-R (Compact> Disc-Recordable) is a variant of audio CDs and digital was invented in 1988 by Philips and Sony CD-Rs were a. The first company Taiyo Yuden, Kodak, Maxell, and TDK manufactures. They are able to store music or data. The CD-R is burned with laser light. The standard CD-R is a polycarbonate disc of 120 mm or 80 mm diameter and a thickness of 1.2 mm. This standard CD-Rs have a capacity of 74 minutes of audio or 650 MB (Mega Bytes) of data.
The non-standard702 MB CD-R discs can store data and 79 minutes and 59 seconds of audio. The surface of the recordable CD-R has a spiral groove that guides the laser beam for writing and reading information. The spiral groove side with a thin layer of organic dye coating, followed by a thin layer of silver, an alloy of silver or gold. Then a final protective layer of paint, the photo-curing, must consist of a thin layer and is cured with UV light at the end. This is like a vacuum is produced.The data are the spiral groove on. To write data to a CD-R, the laser burns the natural organic dye by heating to a certain level. This area of the disc were written to be added to reflect the laser light opaque and less in other areas. When a CD-R is written, learn its organic dye decomposition irreversible. Therefore, once a CD-R is written is permanent and can not be deleted or reused.
Three methods for writing CD-R with a CDRecorder
There are three methods for writing to CD-R with a CD. In "Disc At Once" technology, the CD is written completely and go after the "Closed", no data also may be added to it then. This type of registration is usually in "Live" used audio recordings. This CD is a CD-R read-only.
The "Track At Once" The technology is used for recording a song at a time, so that CD-R, then open for further additions. ThisCDs are able to store data and audio. The third technique is the "packet writing" system in which data is recorded as an appendix, so as to add new data at a later date. This CD-Rs are very similar in the functionality of CD-RW. this technique, some DVD players are due not able to read CD-Rs that.
CD-RW
A CD-RW or "Compact Disc writable King" as the name suggests, is a CD where the data can be written, erased and rewritten. ACD-RW can rewrite what 1000-100000 times, depending on the type of disc. A CD-RW is also able to delete individual files at once.
The CD-RW CD-R is similar in most aspects of collection and use. These are compatible with the Disc At Once "and" Packet Writing ", just like CD-R. The CD-RW discs are written with the phase-change technology." If writing, the laser is the physical condition of the recording layer changes from crystallinePhase of the amorphous phase. The refractive index of the crystalline form is different from the amorphous form and makes the optical disk to read.
Multi Multi Read and play
The CD-R and CD-RW discs can be played on CD players are comfortable. There are a number of DVD players, CD-DVD can only play and are unable to read. This is due to some technological differences between the two formats. The CD-R, CD-RW and DVD are readlasers with different specifications. The CD-R can be read using a 780nm infrared laser, while the disc is read by a visible red 635nm or 650nm laser. The CD-RW can be read by laser 650nm, as its recording layer is not very dependent on the wavelength of the laser for reading.
The optical device used to read DVDs has a numerical aperture opposite from 0.60 to 0.45, as used for CD-R. Thus, some DVD players can not read CD-R discs and laser must be with a double layeralso read CD-R. Most DVD players can read CD-RW, but in some cases the DVD optical system is not sensitive enough to change the read signal to lower reflectivity and a CD-RW.
Consumer demand usually DVD systems, suitable for treating all types of discs. DVD players have been modified to be able to read and play discs other entering MultiRead and multi-play. This is possible by adding an additional optical laserPick-up that produces both types of wavelengths. MultiRead format was created in 1997 by OSTA. This is designed to connect the CD and DVD technologies, allowing the reader to read DVD discs, CD-R and CD-RW.
The OSTA formulated to enable multi-play in 2000 on CD-DVD and electronic devices, compatible with CD-R and CD-RW devices. Then MultiRead and multi-play compatible DVD players and recorders are capable of both CD-R and CD-RW. Morecompatible DVD players and offer a sticker logo on the packaging MultiRead Multiplay by consumers recognize.
No comments:
Post a Comment