What technology does an optical disc drive use to store information?

A CD-ROM is an item that uses optical information as a storage carrier and is used to store data.

Optical disc is a device that uses the principle of laser to read and write, and is a rapidly developing auxiliary memory, which can store a variety of text, sound, graphics, images and animations and other digital information.

The laser head is the central part of the optical drive, through which the optical drive reads data.

An optical disk drive is what we usually call an optical drive, which is a device that reads optical disc information.

Because the disc has a large storage capacity, is cheap, has a long storage time, and is suitable for storing a large amount of data, such as sound, images, animations, information, movies and other information, the optical drive is an indispensable hardware configuration for many computers.

The drive's mechanics are similar to that of a floppy drive, in which there are three motors, each controlling a different function.

On top of the drive there is a motor that rotates the disc, a motor that drives the laser needle to read the data, and a third motor that drives the insertion and exit of the disc.

The structure of a CD R burning disc has five layers:

1.Printing layer.

2.Protective layer.

3.Reflective layer.

4.Dye layer.

5.Underlying.

The structure of a CD-RW burning disc should have seven layers:

1.Printing layer.

2.Protects the adhesive line.

3.Reflective layer.

4.Dielectric layer.

5.Record layer.

6.Dielectric layer.

7.Underlying.

He uses the laser head to generate a laser beam to burn information on the disc.

The principle of storing information on the disc is that in the recording layer of the disc, this is where the signal is recorded at the moment of burning. A special organic dye is applied to the substrate for laser recording and storage.

Due to the difference in reflectivity before and after burning, when the signal of different lengths is read by the laser, the 0 and 1 signals are formed through the change of reflectivity, which forms a binary **, so as to represent the specific data information on the programming.

In general, the recording density of optical discs is limited by the size of the readout spot, i.e., the diffraction limit of the optics, which includes the laser wavelength and the numerical aperture NA of the objective.

Among the optical disc memory currently in use, CD-RW can be used to rewrite write information.

CD-RW platters have a lower write speed than CD-R discs because the laser takes more time to operate on the disc when writing data. Unlike the CD-R organic dye layer, the recording layer of the CD-RW disc is composed of silver, indium, antimony, and tellurium alloys. The burning layer of the alloy has a polycrystalline structure with an emissivity of about 20%.

The laser head of the CD-RW driver has two wavelength settings, P-Write and P-Erase, and the laser heats the contents of the burning layer to between 500 and 700 degrees Celsius to melt it. In the liquid state, the molecules of the substance move freely and the polycrystalline structure is altered to present an amorphous (instantaneous) state.

The reflectivity of the burning layer material solidified in this state is only 5%, and these low reflectivity areas are equivalent to "dents" on the CD-ROM platter.

There is no doubt that it is a! This is a rewritable CD, which can also stand for a CD burner!

The laser head is the heart of the optical drive, and it is also the most precise part. It is mainly responsible for reading data.

The laser head mainly includes: laser generator, semi-reflective prism, objective lens, lens and photodiode. When the laser head reads the data on the platter, the laser light emitted from the laser generator passes through a semi-reflective prism and converges on the objective, which focuses the laser light into extremely small dots of light and hits it onto the disc.

In this case, the reflective material on the disc will reflect the light back through the objective lens, and then onto the semi-reflective prism. In this case, since the prism is a semi-reflective structure, the beam does not completely penetrate it and return to the laser generator, but is reflected, passes through the lens, and reaches the photodiode.

Since the surface of the disc records data at uneven points, the reflected light will go in different directions. Signals in different directions are defined as "0" or "1", and LEDs receive data arranged in "0" and "1" and finally interpret them into the required data.

Because the optical drive works with a laser head, which uses laser reading technology, an optical disc drive is a device that uses laser technology to store information.

Optical disc drives use laser technology to store information.

The structure of a CD R burning disc has five layers:

1.Printing layer.

2.Protective layer.

3.Reflective layer.

4.Dye layer.

5.Underlying.

The structure of a CD-RW burning disc should have seven layers:

1.Printing layer.

2.Protects the adhesive line.

3.Reflective layer.

4.Dielectric layer.

5.Record layer.

6.Dielectric layer.

7.Underlying.

He uses the laser head to generate a laser beam to burn information on the disc.

Use the disc to scatter, use the recorder, record the disc.