What does HDD stand for?

MLA style: "HDD." Acronym Finder . 2012. AcronymFinder.com 30 May. 2012 http://www.acronymfinder.com/Hard-Decision-Decoding-(HDD).html
Chicago style: Acronym Finder . S.v. "HDD." Retrieved May 30 2012 from http://www.acronymfinder.com/Hard-Decision-Decoding-(HDD).html
APA style: HDD. (n.d.) Acronym Finder. (2012). Retrieved May 30 2012 from http://www.acronymfinder.com/Hard-Decision-Decoding-(HDD).html

Hard Decision Decoding

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

Gallager's algorithm is an example of hard decision decoding, which signifies the fact that at each step the messages are derived from local decisions of whether each bit is 0 or 1, and this is all the information the message contains (as opposed to more detailed probabilistic information).

Message passing for the coloring problem: Gallager meets Alon and ...