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Everybody knows that compact discs or commonly known as the ‘CDs’ have almost died and now replaced by the digital world. The main method of music and video delivery now has moved to simple files and streams. But, there’s a problem with this statement, because a CD has not yet deceased by a long shot. It’s still used as a real tool among the belt of artists and bands everywhere. Sure, it’s rapidly diminishing but that doesn’t mean you shouldn’t get one for yourself! In this guide we will take you through the history, types, and the various aspects of compact discs. Plus, we will also give a few expert tips on how to buy CDs online to make your buying process simple, the next time you shop for them. So scroll and read on!
CDs are an optical medium that holds information in the form of bytes. Developed by Philips and Sony these multimedia devices replaced cassettes, VHS, and floppy discs. When compared to other devices, compact discs perform better in terms of storage. They can hold up to 700 MB that is 80 minutes audio and 60 minutes video. Better yet, their low cost nature, people still use the compact discs for writing music, software, video and other computer programmes. And we all know that even today you can find different dance CDs, children, and hip hop CDs out there on the market. You see, the CDs have never really been out of the market since their launch. That said, let’s look at their types and various other aspects before you start your search online.
Many audio compact discs like rock, metal and jazz and video CDs were released in CD format in the 1990- 2010 time period. Even today many musicians, artists and popular bands choose to release their artwork in the form of a CD as it’s easy for distribution. The use aside, you can categorise the compact discs based on operations as read-only, recordable, and rewritable. You could also divide them based on end-use as video, audio, photo, and graphics. And finally, you can categorise them based on quality of content as super audio CD, super video, and digital versatile disc, that’s DVD. Let’s have a look at them in detail below.
A CD-ROM denotes for read-only memory. Here you can store various types of information and content. However, you can only read this content later on and cannot alter it by any means. Moreover, you can play this type of compact disc in any standard and cheap cd players. Initially, this type of media was used prominently in the Pre-recorded music market. However, subsequently, people now use them for writing computer software, licenses, data, and educational contents. These CD types not only ensures safety but also solves the copyright issues. Usually, you can store up to 650MB of data in it.
Recordable compact discs simply mean that you can write contents in this media via a CD drive attached to your PC, laptop, or an external drive. In this case, manufacturers coat a fresh compact disc with a dye that undergoes a change in colour when you pass a light through it. The dye usually is photosensitive in nature. Thus, as a compact disc writer when you pass special laser lights while writing the CD through the disc dye, the dye’s colour changes. Any normal CD player reads this types of compact discs. When reading the disc the drive senses the change in colour to read the stores information. Remember, the dye layer has a shelf-life and over the years its characteristics change.
This type of compact disc uses metallic alloy as against dye in the recordable compact disc. During writing a CD, the properties of metallic alloy layer are changed by the laser rays. This change or any other change in the properties of alloy crystalline or amorphous can be tracked by its reflectivity. The CD players use this change in the metallic alloy in reading the compact disc later. Luckily, most of the compact disc players can read the compact disc burnt this way. However, one of the highlights of this types of compact discs is that you can easily erase the existing in the CD and write new info on it any number of times.
Both audio and video CDs have the capability to store graphical information. However, it requires an exclusive CD cum graphics player to display graphical data. The lyrics of the song and the video content are stored in a graphical format and displayed when played on any best cd player with speakers. You could hook some models of the players to the televisions or PC monitor to experience the extended graphic version of the text/video information on the compact discs. Also, the VCDs have a similar picture quality as that of the VHS and the quality of VCD. Besides, they do not deteriorate as fast. You can play these compact discs on computers, VCD and some DVD players.