A compact disc is also known as a CD, and it’s an optical disc which is utilized in order to retain digital information. The initial format for compact discs was crafted in order to retain and play back audio renderings only. However, as technology progressed, new formats emerged which supported the storage and playback of rewriteable media, audio and data, video, super video, photo, and enhanced music.
These days, a plethora of CD-ROMS and related players are available to all consumers. The first examples of these discs and players became available to consumers back in 1982. Products of this type are available via online retailers, as well as community-based, bricks-and-mortar retailers. Prices will vary widely, especially for the hardware associated with playing these discs.
Features of Standard Compact Discs
Typical CDs feature a diameter of 120 millimeters, and they retain up to eighty minutes of uncompressed audio (or 700 MiB of data). Another type of compact disc is the Mini CD, which comes with a range of diameters, from 60 to 80 millimetres. These small discs are oftentimes utilized in order to store CD singles, and they offer up to 24 minutes of sound.
When compact discs were first introduced, they had a lot more storage then PC hard drives did. However, this is no longer the case. Now, hard drives offer exceptional memory in contrast to compact discs.
During 2004, global sales of compact disc audio, CD-ROM and CD-R grew to thirty billion units. By 2007, 200 billion of these discs were sold all over the globe. Since CDs are now being replaced by alternative forms of digital distribution and storage, including digital downloads and digital drives, CD sales are plummeting. In fact, audio CD sales are now only half of what they were back in 2000.
History of Compact Discs
Compact discs evolved from LaserDisc technology. The first samples of compact discs came from industry leaders, Philiip and Sony, during the mid-to-late 1970s. These two firms worked together later on, in order to offer designs with standardized formats, along with related player technology, which was sold on the open market in 1982.
During the early 1970s, a new turn in CD technology was undertaken by L. Ottens, who directed an audio industry group that was a branch of the Dutch Philips Corporation. This group made a new audio disc that features a circumference of 20 centimeters, with sound quality that rivalled vinyl LPs. Later in this decade, directors at the same company continued to innovate, by providing a tinier optical digital audio disc, as well as a player that supported this new form of technology. At this point, the disc product was officially named a “compact disc”.
Other Compact Disc Facts
Compact discs are crafted primarily of polycarbonate plastic, and they have a thickness of 1.2mm. A typical CD will weigh in at between 16 and 20 grams. Compact discs are read via a crimson laser light beam that performs lightning-fast calculations each second. A CD is played from center to outside, and it features a rotational velocity that ranges between 400 to 250 times per 60 seconds.
The first commercially-sold compact disc player was known as the CDP-101, and it was produced by Sony Corporation. Swedish pop group, ABBA was the first musical act to have an album sold via compact discs. This album was titled, “The Visitor”.
In terms of the most popular CD ever offered for sale, Michael Jackson’s, “Thriller” album is the clear winner. This popular recording, which featured slick dance-pop, sold over 100 million copies, and continues to sell over one hundred thousand copies per annum.