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CD burning technology



Brief introduction

The video file on the hard disk is burned to the disc with a CD burner, and then it can be played on an ordinary VCD or DVD player. Backing up important data on the hard disk to a cheap and safe CD through a CD burner is also a very effective way to protect data.

With the popularity of PCs and the decline in the price of PCs, CD-recording drives have become the standard configuration of personal PCs. More and more people are beginning to use burned discs to store their important files, such as movies, photos, backups of important data, and so on.

The development of CD burning technology has gone through the development process of CD-R, CD-RW, DVD-RAM, DVD-R/RW, DVD+R/RW. In order to make the recording more stable or to meet the needs of different users, technologies such as anti-burning, over-burning, reading and writing methods, and disc encryption are also constantly being developed. The CD format has gradually developed from music CDs and data CDs to video CDs, mixed-mode CDs, bootable CDs, and so on. Due to the continuous development of recording technology and the reduction of the cost of recording products, the application of recording can be popularized, and the recording machine can enter the households of ordinary people.

In order to burn a CD, in addition to the necessary hardware such as the CD drive and CD, it is also very necessary to choose an easy-to-use burning software.

Principle

The optical disc is made of an extremely thin aluminum or gold sound film with a protective layer of polyvinyl chloride plastic. Like floppy disks and hard disks, optical disks can also store files and music information in the form of binary data (a data pattern composed of "0" and "1"). To store data on an optical disc, you must first convert the data into binary with the help of a computer, and then use a laser to burn the data pattern on a flat, reflective disc. The small pits carved by the laser on the disc represent "1", and the blank spaces represent "0".

When reading data from the disc, the directional beam (laser) moves quickly on the surface of the disc. The computer or laser player that reads the data from the disc observes every point the laser passes through to determine whether it reflects the laser. If it does not reflect laser light (there is a small pit), then the computer knows that it represents a "1". If the laser is reflected back, the computer knows that this point is a "0". Then, these thousands or millions of "1"s and "0"s are restored to music, files or programs by the computer or CD player.

System environment

The hardware aspect is mainly the performance configuration requirements of multimedia computers. Due to the difference in storage capacity and data transfer rate of different types of optical discs, the hardware performance requirements when burning optical discs are also different. Usually, the performance of a multimedia computer is mainly checked from two aspects. One is the data transfer rate of the system, including the data transfer rate of the hard disk and the data processing capacity of the CPU. If it is to burn CD or DVD discs, the general multimedia personal computer Hardware performance can meet the recording requirements; if it is to burn high-density DVD discs (such as BD discs), the data transfer rate of the multimedia personal computer system must reach 36Mb/s or more, that is to say, the data rate of the hard disk used by the system must be high , And to ensure continuous and stable reading speed, the CPU must also have a higher data processing capacity, generally a dual-core CPU, otherwise it is very likely that the cache underrun will affect the recording quality, or even burn the disc. The second is the available storage space of the system, including memory available space and hard disk available space. If it is to burn DVD discs, the minimum is 4.7GB and the maximum is 17GB. ), the available hard disk space requirement is higher, because the capacity of a BD is 25~50GB.

In addition to higher hardware performance, the recording parameters should be correctly selected during the recording process, and multitasking and screen savers should be effectively turned off to ensure that the hardware performance is dedicated to the recording of discs.

The software mainly emphasizes the ability of the burning software to burn the disc format to be burned, such as whether it supports BD disc burning, etc. The commonly used Nero, Power2Go and ImgBurn all support BD disc burning. In addition, the ability of the operating system to support the optical disc file format also needs to be considered, for example, whether it supports UDF, etc. This is useful for checking the reading of the burned optical disc.

Burning method

1. Entire disc burning

This method is mainly used for disc copying, and completes the burning of the entire disc at one time. The disc copied by DAO is exactly the same as the source disc. The DAO method can easily complete the duplication of optical discs with gaps between data tracks such as CD records, mixed-type CD-ROMs, etc., and can ensure that the data structure and gap length are exactly the same. However, it should be noted that for the DAO method, some small errors may cause the entire disc to be completely scrapped, so it has higher requirements for the stability of data transmission and the performance of the burner.

2. Track burning

This is a recording method based on tracks. It supports writing several tracks of data to a sector multiple times. TAO is mainly used in the production of music CDs and hybrid and special types of CDs.

3. Fast burning

This is a very common burning method. However, in the early disc burning, because the speed of the host could not meet the needs, the data could only be pre-converted into an image file in the ISO-9660 format before burning, and then burned. The speed of the host can fully meet the requirements of real-time data conversion, and there is no need for preprocessing. This method of automatically converting data into ISO-9660 format and then burning is called fast burning.

4. Section burning

This burning method only burns one section of the disc at a time instead of the entire disc, and the remaining space can be used next time. SAO is often used in the production of multi-session CD-ROMs, and its advantage is that it is suitable for making collections of CD-ROMs. However, each time you burn a new session, it takes about 13MB of space to store the structure of the session, as well as the contact information of the previous paragraph and possibly the next paragraph. Therefore, when burning in this way, if the session is over More will cause a huge waste of disc space.

5. Encapsulated writing

This method is mainly used to make discs in UDF or CD-RFS format, and it has certain requirements for burners. Most of the newly produced CD-R/CD-RW support these types of burning methods, but these methods also need the support of burning software.

Precautions

In the process of disc burning, some technical aspects need to be paid attention to.

First, during the burning process, it is best not to run other programs on the computer, and to close all other running programs. The recorder consumes a lot of system resources when burning a disc. If you run other programs while burning, the CPU usage will increase rapidly, which will cause data transmission to be unsmooth, generate a lot of noise, and even cause the computer to crash. This will not only waste all previous efforts, but also cause damage to the recorder and the computer.

Second, the capacity of the computer hard disk must be large enough and the hard disk read speed must be stable. This is because the recorder first reads the data from the hard disk into the recorder cache, and then writes the disc from the cache. If the hard disk transfer data is unstable, it may cause the disc burning unsuccessful. At the same time, because the data input during burning is first transferred to the buffer, and then the data is streamed from the buffer to the laser reading and writing mechanism of the recorder, the large capacity of the hard disk can provide a large hard disk buffer, which can ensure the data Continuous streaming.

Thirdly, the recorder must ensure that there is always data in the buffer during the process of burning data. If there is no data in the buffer, a gap in the middle may cause the recording to fail. Therefore, it is best to put all the data to be burned into the same partition and run a disk cleaning program to ensure fast file transfer. At the same time, it is best to perform a hard disk scanning program to avoid disk errors.

Fourth, it is better to use English for the file name when burning, because many burning software do not support Chinese file names. If an error occurs during the burning process because of the file name, the burned content will be destroyed, and the gain will not be worth the loss. At the same time, use the burning software you are more familiar with when burning. This is because if you are not familiar with the burning software, operating errors will cause the burning to fail and even burn the disc.

Fifth, do some preparations for the computer before burning. First perform computer anti-virus, otherwise if the computer has a virus, it may infect the disc and burn a virus-containing disc; at the same time, check the desktop display properties and set the screen saver to none; and terminate the network sharing to prevent sudden access by network neighbors And cause the burning to fail.

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