Maybe no one had ever heard of DVD ten years ago. Even today, most people's impression of DVD remains in the nature of movie entertainment. That was not the case. With its technology and amazing data storage, it is gradually replacing CD as a new storage medium. But is there a behind-the-scenes story about its development? The birth of DVD is a little small for storing high-quality audio and video because of the capacity of several hundred megabytes of CD, so everyone hopes to have a new solution. In this context, Pioneer walked in the forefront of the times. In September, 1994, 1994, it introduced an optical media storage format with the same size as CD-ROM but eight times the capacity, which is called high-density CD. Now it is called DVD-9(DS-SL) and DVD- 18(DS-SL). DVD Alliance After Philips was the first to eat crabs, many companies paid more attention to DVD, especially Toshiba introduced its own standards. In order to avoid all kinds of disadvantages brought by vicious competition,1In September, 995, IBM reached a unified standard with the giants, and in September of the same year, a DVD consortium was formed. Subsequently, in April of 1997, the DVD consortium was renamed DVD consortium, with ten members, including seven Japanese manufacturers: Sony, Panasonic, Hitachi, Toshiba, Pioneer, JVC and Mitsubishi, two European manufacturers: Thomson (France), Philips (Netherlands) and an American manufacturer, time warner Inc.. The popularization and promotion of early DVD discs and DVD players were mainly realized by means of high-quality audio-visual entertainment discs. 1in the middle of 1996, the first batch of DVD players were ready for sale, but they failed to enter the market as scheduled due to copyright problems of major film companies. This time was postponed to the date of 165438+ the same year 10, and the first DVD player was officially released. On June 8th,1997,65438+1October 8th, four film companies, namely, Columbia University, Samsung, MGM, New Line and Warner Bros., announced their support for the DVD standard. In March, Warner Bros. announced that seven cities, namely Chicago, Dallas, Los Angeles, San Francisco, Seattle and Washington, were pilot cities for DVD products.

DVD Capacity and Format The DVD discs we see now are generally 4.7G in capacity, which is the so-called D5 disc. There are other unacceptable specifications, such as D9, D 10 and D 18, which can store 8.5G, 9.4G and 17G respectively. The ancestor of its D 10 disk is the above-mentioned ultra-density s D disk jointly developed by Toshiba, Dai Warner and Hollywood Film Company. A beautiful woman opens a restaurant online with a monthly gross profit of 65438+100000, and a little girl earns 8000. When we buy DVD drives, especially DVD burners, we will encounter a problem of supporting formats. Now there are roughly three standards in the field of DVD burning: DVD-RAM, DVD+RW and DVD-RW. As early as 1999, the DVD-RAW standard recorder led by Panasonic came out, but its compatibility was poor and it could not be recognized by the industry. Then, in May, 20001year, Pioneer's DVD-RW product went on the market, and its compatibility was improved, but it was not completely compatible with the existing DVD standard, that is, the DVD player purchased now may not recognize DVD-RW; At this time, the alliance led by Philips introduced a new generation of DVD+RW burners with good compatibility and low price, which intensified the competition. But as far as mainstream DVD recorders are concerned, most of them support DVD+RW and DVD-RW formats. Common sense of DVD We can't help but know that the highest speed of DVD we see is 16X, while the ordinary optical drive is 52X, because the operation speed of the two is different. The double speed of DVD-ROM is 1350 kb/ s, while that of CD-ROM is 150 kb/ s.. The basic speeds of the two are different and cannot be compared. The DVD's 16X has reached its peak speed. In addition, for copyright protection, DVD movies are divided into six regions in the world. The first area is Canada and the United States. The second region is Japan, Europe, the Middle East, Egypt and South Africa; The third region is Southeast Asia and East Asia (Hongkong, Taiwan Province Province, Korea, Thailand, Indonesia); Fourth area is Australia, New Zealand, South Pacific Islands, Central America, Mexico and South America; The fifth region is Africa, India, Central Asia, Mongolia, Russia and North Korea; The sixth district is China. CDs that are not in this area cannot be played on DVD players in this area. So buying DVD-ROM without area code protection is the best choice.