HDD

HDD may refer to:

• Heating degree day, quantitative indices designed to reflect the demand for energy
• Horizontal Directional Drilling, a steerable trenchless method of installing underground pipes

Technology and computing

• High definition display, in reference to high-definition video, high-definition television (HDTV), or Intel High Definition Audio
• Hard disk drive, a computer device which stores digitally encoded data
• /dev/hdd, the slave device on the second ATA channel (see also /dev/hda)

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