Updated: 08/31/2020 by Computer Hope

HD may refer to any of the following:

Green letters HD on black background.

1. HD is an initialism used for hard drive, although you may also see it written as "HDD" for hard disk drive.

2. Short for high definition, HD describes a standard of digital video or audio. For video, it means 1280 x 720 pixels, or 720p on televisions. See the HDTV (high-definition television) definition for further information and related links.

For audio, HD means sound with 16-bit depth and at least a 44.1 kHz sampling rate.

3. Short for high density, HD is a type of floppy diskette. See our high-density disk definition for further information.

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