CD-ROM (optical drive) as a standard external storage device on the PC has a long history, with the continuous reduced production cost of DVD technology, it has become a strong opponent of CD-ROM, in order to enhance the optical drive Vitality, many optical drives, such as: Apache, Yuanxing, Acer, Mida, etc., have spared a new technique for seismic, noise reduction and improved data reading capabilities. The application of new technologies will undoubtedly let the "hero's late" CD-ROM drive, I believe that in the next period, the optical drive will also act as a difficult-in-one role in the PC field. There are a lot of new technologies for the CD-ROM drive, and we will analyze some of the more concerned with some of the CD-ROMs that are not familiar with, first talk about the earth-driven shock absorbing technology.
The optical drive is vibrating in the operation, which affects the track focusing of the optical drive and the radial focusing ability, and the vibration of the optical drive in the actual application has always been a big problem. In China, Apac's light is slightly better than this. When the optical drive is 40 times, when the disc is run at a speed of 6000 rpm, the larger centrifugal force is easily caused to occur, and no noise is generated. Apache 52x optical drive has designed a novel "noise reduction and shock absorbing structure" for this purpose, which divides the long air cavity of the traditional design of the optical drive to a smaller "beehouse", which is alleviated, and will The noise generated by the optical drive is blocked due to vibration. When we use Apache, Apaci quietly, only a little slight voice, giving people feel comfortable. In addition, the upcoming Apache second generation has also adopted ABS (Auto Balance System, Automatic Balance System) technology, which is the exclusive balance technology in their 40x speed diamond drive, specializing in processing eccentricity. Inferred trays with uneven density. It is a special steel bearing bearing that is configured under the tray of the optical drive. If the disk quality is not good, it will cause the high-speed rotation when reading will lead to the centrifugal force of steel balls at all times, so that steel beads will Moved at one end of the disc in the same level under the action of the centrifugal force, so that the optical disk can always be on the same horizontal surface without the offset, which has enabled the reading capability of the optical drive to improve. In addition to Apac, domestic Acer also uses this technology in their crocodile series products.
In addition, there is a DDSS and CSS shock absorbing system. The two shock absorbers are not lost as an advanced technology, of which DDSS technology has been widely used by major brands and is one of the most popular shock absorbing technologies.
CSS is the unique design used in the latest 50-times speed drive. This technology is to turn the shock absorber layer of the damper system from the two layers of the DDSS to three layers, which is also better to overcome the copy disk. The phenomenon of chaos, and the principle of CSS work is not different from DDSS. It is not ideal for horizontal vibration. In actual testing, the US 50-fold speed drive is better, and the error correction Yes, just feel that there is no significant difference in the product with Meida.
On the 48-speed optical drive of the source, we can see another method for reducing spindle motor vibration - rotating motor using liquid bearings. The advantage of liquid bearing is that the friction is small, so even if the motor speed is high, the vibration brings is very slight, the noise is low, the heat generation is small, which can greatly extend the life of the motor, the cost will be lower, the stability of the source of the source Sex and error correction are very good, it is very much.
The optical drive's data reading technology is also a technology that has been introduced. At present, the optical drive data transmission technology has three types of CLV, CAV, PCAV. The CLV-constant line speed refers to the transmission rate of the data remains unchanged when the optical drive is read. With regard not to consider the motor, the CLV is a very ideal state, but when the optical drive reaches 20 times, the problem brings to the problem, because the motor speed is quite high when reading the optical disk data. At this time, even if the motor's power is followed, his life will also be greatly shortened. So after 20 times, all vendors turned to CAV-constant angular velocity technology. The advantage of CAV technology is that the spindle motor does not have to adjust the speed, but not only the service life of the spindle motor, but also improves data reading performance, but the data transfer rate of the optical drive using CAV technology cannot always be consistent, this is because the disc The rotating angular velocity is the same, the linear speed of the outer ring is larger than the inner ring, and the distance from the laser head is larger than the inner ring in the same time, and the longer distance means energy in the case where the density of the data area is constant. Read more data, so the data transfer rate of the outer ring is larger than the inner ring. In practical applications, the average speed of the optical drive read disc with CAV technology is much lower than that of the nominal value, and it is not ideal for this technology. In response to the shortcomings in CLV and CAV technology, a more advanced PCAV data transmission technology has been adopted like Apac's new optical drive, PCAV is actually a comprehensive technology, his working principle is when reading a disc When the inner circle data is used, traditional CLV technology is used; and when the laser head is gradually shifted, CAV is prepared when the optical disc is used. Because of the advantages of CLV and CAV, it is also very effective in integrating the reading rate of the optical drive to improve the optical drive. When we tested Apache, Acer, Great White Shark and Meida, a new genuine software CD was selected, the biggest possible excluded the data brought about by CD quality problems. Explanation, the faster the above transmission speed, especially the average transmission speed reflects the case of the actual use of data transmission speed, and the smaller the time and the CPU share, the smaller, at this point, a macro-drive drive The comprehensive reading speed of Apac's drive is relatively fast, and Apac's seek time is greatly leading to other optical drives, in terms of system resources, Dahuai shark is good.
Next, let's talk about the intelligent error correction and noise reduction technology of the optical drive. In the country, most users have a high error correction ability for the CD-ROM drive. Therefore, it is also a key point for the development of the new technology. At present, there are more advanced optical drives with advanced optical drives in domestic error correction techniques. Among them, Apac's optical drive uses artificial intelligence error correction technology (AIEC), which is a large number of defective residues in design, and performs processing and calculation, take different reading methods. Memory in the CD-ROM-driven chip, when you read the disk, no matter what kind of problem, you can classify it, it is worth mentioning that this optical drive uses a variable speed technology, which is to press and exit the tray button in the high-speed operation. To 16X, this design can increase the error correction ability and reduce noise, which directly avoids high-speed optical drive to read poor discs, the change of the change in the optical drive master and the control circuit, which is greatly reduced. The loss of machinery and improves reading data. In addition to Apache, Middard and Great White Shark use the AIEC artificial intelligence error correction technology, which is the same as the technical principles used by the above Apac's drive. The error correction capabilities of these products have been recognized by users. The company's 50-times speed drive program chip information is writable. Users can write the new AICE information provided by Meida to the program chip, which is easy to complete. The upgrade of the CD-ROM drive, this design has been well received by users.
