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What is the capacity of a CD?
700 MB
A standard compact disc measures 4.7 inches, or 120 millimeters (mm), across, is 1.2 mm thick, weighs between 15 grams and 20 grams, and has a capacity of 80 minutes of audio, or 650 megabytes (MB) to 700 MB of data. A CD works by focusing a 780 nanometer wavelength semiconductor laser onto a single track of the disc.
What is the difference between an audio CD and a regular CD?
Audio CDs are stored in the media in its original uncompressed form at a bit rate of 1411bits/sec. MP3 CDs are stored compressed at bit varying bit rates of around 64 to 256 bits per second. The primary advantage of MP3 CDs is the big difference in the number of files stored in a single disc.
How long will a CD last?
The relative stability of optical disc formats
| Optical disc formats | Average longevity |
|---|---|
| CD-R (phthalocyanine dye, gold metal layer) | >100 years |
| CD-R (phthalocyanine dye, silver alloy metal layer) | 50 to 100 years |
| DVD-R (gold metal layer) | 50 to 100 years |
| CD (read-only, such as an audio CD) | 50 to 100 years |
How many minutes are on a 700-megabyte CD?
As a general rule, one minute of a compressed audio file is approximately equal to 1 megabyte of data. Thus, a 700-megabyte CD can hold close to 700 minutes of compressed music files.
What is the storage capacity of a CD?
The storage capacity of a CD is divided into minutes, seconds and sectors. There are 75 sectors per second, 60 seconds per minute and 74 minutes per disc on high-capacity types.
What is the capacity of a compact disc?
A compact disc’s information capacity is between 650 and 700 megabytes. Typically, approximately 50 megabytes are used for the purposes of file structure and indexing. Audio compact discs, which feature uncompressed digital audio files, take up more space than compressed audio files like the popular MP3 format.