What is CD? Read this post to know it.

CD (the abbreviation of Compact Disc) is a digital optical disc data storage format. The standard CDs can hold up to about 80 minutes of uncompressed audio or about 700 MB of data. The Mini CD has various diameters ranging from 60 to 80 millimeters (2.4 to 3.1 in).

what is CD

If you want to learn some useful and basic information about CD, please keep in reading.

Physical Details

Basic specifications of CD: (according to the Audio-CD Standard Red Book which is published in September, 1983):

Scanning speed: 1.2-1.4 m/s; Constant Linear Velocity / CLV – about equal to 500 revolutions per minute of the inner ring, 200 revolutions per minute of the outer ring.

Track pitch: 1.65 microns

Diameter: 120 mm

Diameter of disc: 1.2 mm

Inner radius area: 24 mm

Outer radius area: 358 mm

Read and write speed: 1X = 150 KiB / s = 153,600 Bytes / s

Capacity: 700MB

CD saves some digital files for you. If these files are lost or deleted by mistake, you can use a piece of third-party data recovery software to get your data back. Here, you can use MiniTool Power Data Recovery and its “CD/DVD Recovery” module to do this job.


Audio-CD includes one or more stereo tracks, 16bit PCM encoding, and a sampling rate of 44.1 kHz. The standard CD has a diameter of 120 mm which can store approximately 80 minutes of audio. Besides, an 80mm laser disc, which is sometimes used to issue CD singles, can store about 20 minutes of sound data.

Music CD does not have error correction capability.

Glass CD:

This CD is made up of glass.

As to CD data recovery, you can also refer to this post to get more useful information: Make Your Move To Recover CD/DVD Disk At Once.

The Main Logical Formats of CD

The main logical formats of CD are various, including Audio CD, Super Audio CD, CD-MIDI, CD-ROM, Video CD (VCD), Super Video CD, Photo CD, CD-i, CD-i Ready, Enhanced Music CD (CD+), and Vinyl Disc.


Now, you learn the basic information of CD, such as its diameter, scanning speed, read and write speed, capacity and more. Of course, CD saves some important files for you. So, you need to protect it well in your daily life and work to keep your data safe. When data loss issue happens, you can use a piece of third-party data recovery software to get your data back.

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