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This article mainly introduces what CD-ROM refers to in the computer, the article is very detailed, has a certain reference value, interested friends must read it!

CD-ROM refers to "CD-ROM", the full name of "CD-ROM", is an external storage medium that can store a large amount of data, a kind of optical disc used on a computer; this kind of disc can only write data once, and the information will be permanently stored on the disc, and the information will be read out through the CD-ROM drive when in use.

CD-ROM (Compact Disc Read-Only Memory), that is, read-only CD, is a kind of optical disc used on a computer, an external storage medium that can store a large amount of data.

This kind of disc can only write data once, and the information will be permanently stored on the disc and read out through the disc drive when in use. A compact disc is about 4.5 inches in diameter and 8 inches thick and can hold about 660 megabytes of data.

All CD-ROM disks are pressed from a master disk and then packaged in a polycarbonate protective shell. The data recorded on the master disk is in the shape of a spiral, scattered outward from the center, and there are many tiny pits on the disk surface, which is the recorded digital information. When reading the data on CD-ROM, the laser beam is used to scan the optical disc, and the digital information is obtained according to the reflection change of the laser on the pit. The information in the disk is stored in a spiral light path.

The yellow book of CD-ROM specification, launched by Philips, Sony and Microsoft in 1983, has undergone several corrections. The yellow book adopts the physical format of CD-DA (Redbook) and adds a layer of error detection and correction standards to ensure the reliability of data storage. In addition, synchronization and marking information are added for more accurate positioning. The Yellow Book prescribes two modes, providing different error detection and correction mechanisms, because storing data documents (computer files) does not allow any errors, while data such as video and sound can allow a few errors. In 1989, the Yellow Book was accepted by ISO as the international standard for data exchange on 120mm CD-ROM (CD-ROM)-ISO/IEC 10149.

CD-ROM is a read-only optical storage medium that can store 74-80 minutes of high-fidelity audio or 682MB (74 minutes) / 737MB (80 minutes) data information on a single disk with a diameter of 120mm (4.72 inches) and 1.2mm (0.047 inches) thick. CD-ROM has the same shape as a common CD disc, but CD-ROM stores data rather than audio. The way of reading data by CD-ROM driver in PC is similar to that of CD player, but the main difference is that check and error correction mechanism is introduced into CD-ROM driver circuit to ensure that errors do not occur when reading data.

The above is all the contents of the article "what does CD-ROM in the computer mean?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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