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HDD may refer to: Hard disk drive, an electro-mechanical data storage device , see Device file § naming conventions High-definition display Head-down display H. D. Deve Gowda (born 1933), a former prime minister of India Hand Drawn Dracula, a record label Heating degree day Horizontal directional drilling Hyderabad Airport (Sindh), Pakistan (IATA code: HDD) Handan East railway station (China Railway pinyin code HDD) Honorary Doctor of Divinity Hard Drive Divinity, the transformed state of CPUs in the Hyperdimension Neptunia series