What type of memory does a read-only disc belong to?

Read-only discs are external memories. Compact disc read-only (CD-ROM) is an external storage medium that can store a large amount of data, and is a type of optical disc memory; optical disc memory is a device that uses laser principles to read and write, and is a rapidly developing type of auxiliary memory ( External memory), which can store various multimedia digital information such as text, sound, graphics, images and animations.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Read-only discs are external memories.

Compact disc (CD-ROM) is a type of optical disc memory; optical disc memory is a device that uses laser principles to read and write, and is a rapidly developing auxiliary memory (external memory) , can store various multimedia digital information such as text, sound, graphics, images and animations.

CD-ROM (Compact Disc Read-Only Memory) is a CD-ROM used on computers. This kind of optical disc can only write data once, the information will be permanently stored on the optical disc, and the information will be read out by the optical disc drive when used. The CD format was originally designed for music storage and playback. In 1985, the Yellow Book standard developed by SONY and Philips enabled this format to adapt to various binary data. Some CD-ROMs store both music and computer data. The music on such CD-ROMs can be played by a CD player, but the computer data can only be processed by the computer.

CD-ROM, compact disc read-only memory, an external storage medium capable of storing large amounts of data. A compressed optical disc is approximately 4.5 inches in diameter, 1/8 inch thick, and can hold approximately 660 megabytes The data. All CD-ROM discs are pressed from a master disc and then encased in a protective polycarbonate casing. The data recorded on the master disk is in a spiral shape, spreading out from the center. There are many tiny pits on the surface of the disk, which are the recorded digital information. When reading data on a CD-ROM, a laser beam is used to scan the disc, and digital information is obtained based on the reflection changes of the laser on the small pits. The information on the disk is stored in spiral optical tracks.

Reading CD-ROM

The speed of the CD-ROM drive is expressed as "X speed". The speed standards are 2x speed, 4x speed, and 8x speed. Wait, it can currently reach 50 times speed. With the development of technology, digital versatile disks (DVDs) have appeared. Its storage capacity is larger, now reaching 9.4 gigabytes, and even higher, and the image clarity is better and the high-fidelity effect is also better.

CD-ROM is an optical disc specification used in computers. The device that reads the optical disc is called a CD-ROM drive. The data stored on the optical disc is read using laser light instead of Read magnetically, so discs can be stored for decades. The format of optical discs used by computers is the same as the format of music compact discs (CDs) played by laser discs in ordinary homes. The data capacity of an optical disc is as high as 650MB (74 minutes), which is about 450 1.44MB floppy disks. Generally, floppy disks are rewritable, but optical discs can only read data, not write data (if you have a CD-R recordable optical drive and a CD-R blank with burning software, you can write data on the optical disc. write data on-chip). At present, most computers have CD-ROM as standard equipment, and the speed of CD-ROM ranges from 1x, 2x...24x, 32x, to the fastest speed of 40x... Generations change very quickly, and the optical disc used in computer systems is also called CD-Title.

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