CD ROM full form Compact Disc Read-Only Memory. Is a type of computer memory in the form of a compact disc that is read by the optical medium.
The standard compact disc was introduced in 1982 for digital audio reproduction. But, because any type of information can be presented digitally, the standard CD was adopted by the computer industry in the mid-1980s as low-cost storage and distribution medium for large computer programs, graphics, and databases. went. With a storage capacity of 680 megabytes, CD-ROMs quickly gained commercial acceptance as an alternative to the so-called floppy disk (with a maximum capacity of 1.4 megabytes).
सीडी रोम का फुल फॉर्म कॉम्पैक्ट डिस्क रीड ओनली मेमोरी। कॉम्पैक्ट डिस्क के रूप में एक प्रकार की कंप्यूटर मेमोरी है जिसे ऑप्टिकल माध्यम द्वारा पढ़ा जाता है।
मानक कॉम्पैक्ट डिस्क 1982 में डिजिटल ऑडियो प्रजनन के लिए पेश की गई थी। लेकिन, क्योंकि किसी भी प्रकार की जानकारी को डिजिटल रूप से प्रस्तुत किया जा सकता है, मानक सीडी को कंप्यूटर उद्योग द्वारा 1980 के दशक के मध्य में बड़े कंप्यूटर प्रोग्राम, ग्राफिक्स और डेटाबेस के लिए कम लागत वाले भंडारण और वितरण माध्यम के रूप में अपनाया गया था। चला गया। 680 मेगाबाइट की भंडारण क्षमता के साथ, सीडी-रोम ने तथाकथित फ्लॉपी डिस्क (1.4 मेगाबाइट की अधिकतम क्षमता के साथ) के विकल्प के रूप में जल्दी से व्यावसायिक स्वीकृति प्राप्त की।
- The CD-ROM is made of clear polycarbonate plastic, coated with reflective material and a protective coat of clear lacquer.
- CD-ROMs can only be read by CD-ROM readers. Ordinary readers cannot read CD-ROM discs.
- A CD-ROM can hold roughly 3,00,000 typed pages, up to 700 megabytes of data.
- It can also store audio, still video, pictures, animated graphics, and full-motion video.
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The CD-ROM format was introduced in 1982 by Danon, a Japanese company. Later, the CD-ROM was introduced by Danon and Sony at the first Japanese COMDEX computer show in 1985. Back then CD-ROM was famous and used everywhere. It developed on its own. The CD-ROM format was introduced by Sony and Philips in 1983, called Yellow Book.
CD ROM full form: Advantages
- CD-ROMs can be accessed randomly.
- CD-ROMs are the most cost-effective way to produce and distribute large amounts of data.
- Compared to other storage discs, a CD-ROM is very strong.
- It is long-lasting.
- It is a secure medium for storing large amounts of read-only information.
CD ROM full form: Disadvantage
- The biggest complaint is that they are relatively slow.
- Once it is filled with data, new data cannot be entered into it.
- Smaller storage capacity than hard disk.
- It can be scratched easily and will not function properly after scratching.
- In 1988, the Yellow Book was published, which describes parameter guidelines in the case of CD-ROMs.
- 1989, CD-ROM was standardized as the ISO/IEC 10149/ECMA-130 standard.
- In the case of CD-ROMs, the ISO 9660 standard describes the file system.
CD-ROM Data Capacity
- CD-ROM capacity is usually expressed with a binary prefix, with the space storage deducted to be used in case of error correction data.
- A typical 120 mm, 800 MB CD-ROM can store about 829 MB of data with essentially error correction, for a total of 952 MB of data.
Data encoding and reading
CD-ROMs, like other CD variations, contain data encoded in spiral tracks beginning in the center and ending at the outermost edge of the disc. The spiral track holds about 650 MB of data. That’s about 5.5 billion bits. The distance between two rows of pits measured from the center of one track to the center of the other is called the track pitch. Track pitch can range from 1.5 to 1.7 µm but is 1.6 µm in most cases.
Constant Linear Velocity (CLV) is the principle by which data is read from a CD-ROM. This principle states that the read head must interact with the data track at a constant rate whether it is accessing data from internal or external parts of the disk.
This is affected by changing the speed of the disc rotation from 500 rpm in the center to 200 rpm outside. In music CDs, the data is read sequentially so rotation speed is not an issue. CD-ROMs, on the other hand, must be read in a random pattern, which requires the rotation speed to change continuously. Pauses in the read function are audible and can be quite noisy on some fast drives.
Which drive letter do the CD-ROM belong to?
By default, your CD-ROM should be specified by D when you are viewing different drives on your computer. However, if you add another hard drive to the computer or create a partition, the CD-ROM’s drive letter may be moved alphabetically down, such as from D: E to E. So Follow the steps below to determine which drive letter your CD-ROM is under.
- Open Windows Explorer by pressing Windows Key + E.
- From the list on the left side of the Explorer window, click This PC.
- You should see a list of all the drives on your computer with their respective letters, as shown below.
If the disc drive contains a CD, DVD, or another disc, you’ll want to double-click the disc drive icon in Explorer. If the disc plays automatically and you want to browse the files on the disc, right-click the disc icon and choose Open or Explore.
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FAQs On CD ROM full form
What is a CD-ROM used for?
Used to store program and data files, a CD-ROM holds 650 MB or 700 MB of data and employs a different recording format than the audio CD (CD-DA), from which it evolved. In the 1990s, CD-ROMs increasingly replaced floppy disks for software distribution.
What is a CD-ROM Example?
CD-ROM Drive Definition A CD-ROM drive is the place on a computer where a compact disc can be placed, read, and played. An example of a CD-ROM drive is where a person can play a music CD on a computer.
Is CD-ROM a part of the Internet?
A CD-ROM (/siːdiːˈrɒm/, compact disc read-only memory) is a pre-pressed optical compact disc that contains data. Computer CD-ROMs can read- but cannot write or erase, meaning it is a type of read-only memory.
What is a CD-ROM made of?
They look just like audio CDs and store and receive data in the same way. Thanks to a layer of aluminum, they are reflective and made of 1.2mm polycarbonate plastic. While most are 120mm, mini versions exist as well.
Is ROM a memory?
RAM is the volatile memory that temporarily stores the files you are working on. Therefore ROM is a non-volatile memory that permanently stores the instructions for your computer.