CD Compact Disc

 Compact Disc

A CD, short for Compact Disc, is an optical storage medium used for digital data storage. It was first introduced in the 1980s and quickly became popular for storing and playing back music, as well as for software distribution.


A CD is a circular disc made of polycarbonate plastic, with a diameter of 120mm and a thickness of 1.2mm. The data is stored on a spiral track of pits and lands molded into the surface of the disc. A CD can store up to 700 MB of data, which is equivalent to about 80 minutes of audio or thousands of digital files.

To read data from a CD, a laser beam is used to scan the surface of the disc and detect the changes in reflectivity caused by the pits and lands. The data is then converted into digital signals that can be decoded by a CD player or computer.

एक सीडी पॉलीकार्बोनेट प्लास्टिक से बनी एक गोलाकार डिस्क होती है, जिसका व्यास 120 मिमी और मोटाई 1.2 मिमी होती है। डेटा को डिस्क की सतह में ढाले गए गड्ढों और भूमि के सर्पिल ट्रैक पर संग्रहीत किया जाता है। एक सीडी 700 एमबी तक डेटा स्टोर कर सकती है, जो लगभग 80 मिनट के ऑडियो या हजारों डिजिटल फाइलों के बराबर है। सीडी से डेटा पढ़ने के लिए, डिस्क की सतह को स्कैन करने के लिए एक लेजर बीम का उपयोग किया जाता है और गड्ढों और भूमि के कारण परावर्तकता में परिवर्तन का पता लगाया जाता है। डेटा को तब डिजिटल सिग्नल में परिवर्तित किया जाता है जिसे सीडी प्लेयर या कंप्यूटर द्वारा डिकोड किया जा सकता है।

Here are some key features and benefits of CDs:

  1. High storage capacity

  2. Easy to use

  3. Affordable

  4. Durable

  5. Compatible

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