DD

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DD

(storage)

DD

(database)

DD

(programming)

dd

(4)
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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DD

On drawings, abbr. for Dutch door.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

DD

(1) See Dolby Digital.

(2) (Double Density) The designation for the first generation of floppy disks (for details, see HD). See floppy disk.
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