DD

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(1) See Dolby Digital.

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

On drawings, abbr. for Dutch door.

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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No references found			DC3 DC4 DCA DCALGOL DCB DCC DCCI DCD DCDi DCDL DCE DCFL DCG DCI DCIM DCL DCMS DCNA DCOM DCP DCPA DCS DCT DCTL dcwv DD DD2 DDA DDA value DDB DDBMS DDBS DDCMP DDD DDE DDE Manager ddI DDIF DDL DDM DDML DDN DDN NIC DDNS DDNS relay DDO DDP DDR DDR-RAM DDR-SDRAM DDRAM			DCXRD DCY DCYAC DCYBA DCYC DCYD DCYF DCYFS DCYH DCYHA DCYHC DCYHP DCYM DCYO Dcyop DCYP DCYR DCYRA DCYS DCYSC DCYT DCZ DCZM DCZT DD dD ACP DD EX DD FORM Dd palmer DD&A DD&BD DD&C DD&CS DD&CTA DD&D DD-DFE DD-DLL DD-FDTD DD-I DD-LMS DD-MZM DD-PCR DD-PLL DD-RLS dd. DD/BR

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