What is compact disk?
What is compact disk?
Compact disc (CD), a molded plastic disc containing digital data that is scanned by a laser beam for the reproduction of recorded sound and other information. Since its commercial introduction in 1982, the audio CD has almost completely replaced the phonograph disc (or record) for high-fidelity recorded music.
What are the advantages of compact disk?
7. Compact Disks
| Advantages of CDs | Disadvantages of CDs |
|---|---|
| Small and portable | Fairly fragile, easy to snap or scratch |
| Very cheap to produce | Smaller storage capacity than a hard drive or DVD |
| Most computers can read CDs. If there is no CD drive, a DVD drive can usually read them | Slower to access than the hard disk. |
How does a compact disc work?
It takes a very precise laser beam focused on the data track as the CD spins rapidly around. The laser beam passes through the polycarbonate layer and reflects off the aluminum layer. As it does so, a sensor detects changes in the laser beam’s reflection, since the bumps cause the laser to reflect differently.
What do people use CD for?
As above CDs are a wonderful storage and archiving medium. As any format of file can be written on to the disc, everything from designs, spreadsheets, databases, letters, contracts, emails backups, pictures, video and audio can be stored and backed up to disc.
Which is an example of a compact disc?
The picture is an example of the bottom of a standard compact disc and is the side the disc player reads. The opposite side of the disc has a label to help indicate what is on the disc. When referring to a round CD, DVD, or Blu-ray it is known as a ” disc ” and not a “disk.”
How much data can a compact disc hold?
As we mentioned above, compact discs are used to store data so that may be retrieved or executed at a later date. CDs can store software programs so that you may load them onto your computer. The standard CD is capable of holding 72 minutes of music or 650 MB of data. An 80 minute CD is capable of holding 700 MB of data.
When was the first compact disc disc made?
Compact Disc. Abbreviated as CD, a compact disc is a flat, round, optical storage medium invented by James Russell. The first CD was created at a Philips factory in Germany on August 17, 1982.
What’s the difference between a CD and a data disc?
If you’re burning a CD with MP3 music audio files, the disc is a data disc and not an audio disc. In other words, a disc with MP3 files could store a lot more than 80 minutes of music. What came before a CD?