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DD
(redirected from Doctor of Divinity)

    Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson 0.06 sec.

DD

(Double Density) The designation for low-density diskettes, typically the 5.25" 360K and 3.5" 720K floppies. See double density. Contrast with HD.

1.(storage)DD - double density.
2.(database)DD - data dictionary.
3.(programming)DD - Deployment Descriptor.
4.dd - A Unix copy command with special options suitable for block-oriented devices; it was often used in heavy-handed system maintenance, as in "Let's "dd" the root partition onto a tape, then use the boot PROM to load it back on to a new disk".

dd had a distinctly non-Unixy keyword option syntax reminiscent of IBM System/360 JCL (which had an elaborate DD "Dataset Definition" specification for I/O devices). Though the command filled a need, the interface design was clearly a prank.
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