DVD

 A DVD, short for Digital Versatile Disc, is an optical storage medium used for digital data storage. It was introduced in the late 1990s and quickly became popular for storing and playing back movies, as well as for software distribution.

A DVD 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 single-layer DVD can store up to 4.7 GB of data, while a dual-layer DVD can store up to 8.5 GB of data.

To read data from a DVD, 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 DVD player or computer.

DVD पॉलीकार्बोनेट प्लास्टिक से बनी एक गोलाकार डिस्क होती है, जिसका व्यास 120mm और मोटाई 1.2mm होती है। डेटा को डिस्क की सतह में ढाले गए गड्ढों और भूमि के सर्पिल ट्रैक पर संग्रहीत किया जाता है। एक सिंगल-लेयर DVD 4.7GB तक डेटा स्टोर कर सकता है, जबकि एक डुअल-लेयर DVD 8.5GB तक डेटा स्टोर कर सकता है। डीवीडी 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 डीवीडी प्लेयर या कंप्यूटर द्वारा डिकोड किया जा सकता है।

Here are some key features and benefits of DVDs:

  1. High storage capacity

  2. High quality

  3. Easy to use

  4. Durable

  5. Compatible

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