HDD

The abbreviation HDD stands for:

• Hard disk drive (permanent / mass storage), see Hard disk drive
• House of Democracy
• Head-down display
• High Density (diskette) , one of several possible recording densities on diskettes
• Company abbreviation for Heidelberger Druckmaschinen on the stock exchange
• Horizontal Direction Drilling, a horizontal directional drilling process

This is a disambiguation page for differentiating between several terms identified with the same word.