The Digital Video Disc or DVD resembles the usual CD, but stores data five to ten times more than the usual CD. The DVD was perceived to be a solution of many entertainment companies who used several CDs for their high-tech games. It also held great promise in the movie industry, as you had to flip laserdiscs in order to finish the video. DVDs promised better picture quality as well. The DVD has truly revolutionized the face of the entertainment industry, whether it’s movies, music, or games.
History of the DVD
The DVD, also called a digital versatile disc, is a high-density medium first conceptualized by Philips and Sony in May 1994. This groundbreaking technology aimed to be an improved version of compact discs of computers. It also threatened to make laserdiscs and VHS obsolete.
The development of the DVD had many great prospects, and it was no surprise that companies competed to develop this technology. Warner Home Entertainment and Toshiba wanted to develop a similar technology, but had problems with DVD formatting. The Hollywood Digital Video Disc Advisory Group and movie outfits all had a say with the development of the DVD.
But it was Sony who first succeeded in completing the DVD technology. The system was exhibited in the January 1995 leg of the Winter Consumer Electronics Show by John Eargle. The DVD had “two layers,” which increased its memory to 7.4 gigabytes. Before the end of the month, Toshiba launched its own type of DVD. It has a memory of 10 gigabytes, which made it bigger and better than Sony’s product. The picture was greatly improved in Toshiba’s model. Because of this, companies such as Pioneer, Hitachi, Matsushita, MCA and Thomson made DVDs similar to Toshiba. In the spring of 1995, Toshiba developed a Super Density disc, another type of two-layer disc.
Sony and Toshiba butted head to head, but when Microsoft, IBM, HP, Fujitsu, Compaq and Apple refused to support the any of the competition, the two companies decided to work with each other. The cooperation involved exchange of ideas and technologies. The result was the EFM plus, a disc with Toshiba’s SD feature and Sony’s data coding methodologies. In 1996, an agreement was settled to divide the royalties with the involved companies and the patent licensor as well.
The development came with the birth of the different types of DVDs. One type is the DVD-ROM, which are mass-produced discs with data stamped by molding machines. With a DVD-ROM, the data can only be read. The DVD-RW and DVD-RAM are known as rewritable DVD. The data can be written on the disc and erased afterwards for a couple of times.
The DVD contains a spiral groove, which is located at the center of the disc. This groove contains the Media Identification Code (MID), which bears the identification data of the disc which cannot be tampered with. The MID contains vital data as to who manufactured the disc, the memory capacity of the CD, and the burning speeds.