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# How many megabytes does a CD hold?

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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.

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Audio compact discs, which feature uncompressed digital audio files, take up more space than compressed audio files like the popular MP3 format. There is a maximum of 74 minutes of music on an audio 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.

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.

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## Related Questions

• A:

One gigabyte is equal to 1,024 megabytes. A gigabyte also equates to 0.00098 terabytes. A gigabyte is a multiple for a byte of digital information, and is used in regard to the transmission and storage of that type of data.

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The number of minutes on a blank CD varies according to size, but a standard 12-centimeter blank CD has either 74 or 80 minutes available. For an 8-centimeter blank CD, 21 minutes is the industry standard.

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• A:

For high-definition photos at 250 kilobytes of memory each, a 1-gigabyte memory card holds 4,000 pictures. HD wallpaper images are about 250 kilobytes; personal pictures are smaller and require less memory. Super-HD images of 2,560 by 1,600 pixels are up to 1.6 megabytes. A 1-gigabyte card holds 625 such photos.