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DiskDoubler - Just Solve the File Format Problem

DiskDoubler

From Just Solve the File Format Problem
Revision as of 13:05, 2 April 2024 by Sembiance (Talk | contribs)

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File Format
Name DiskDoubler
Ontology
Extension(s) .dd, .sea, others/special
PRONOM fmt/1399
Type Code DDFL, DD01, DDF2, DDF3
Wikidata ID Q100243145

Norton DiskDoubler (DD) was a data compression utility for compressing files on the Apple Macintosh platform. Unlike most such programs, which compress numerous files into a single archive for transmission, DiskDoubler was intended to compress single files "in place" to save space on the drive. When such a file was opened, DiskDoubler would decompress the file before handing it off to the application for use. A later addition, AutoDoubler, added background compression, finding and compressing files automatically when the computer was idle.

[TODO: According to macutil, there are more DiskDoubler formats: an archive format, a self-extracting archive format, and a self-decompressing file format.]

Contents

File Identification

DiskDoubler files have no extension, they maintain the source file name and extension (if used).

DiskDoubler files have the magic number (hex values) AB CD 00 54 for the first 4 bytes.

The header will also include the Macintosh Type/Creator code for the original source file.

Creator Code is "DDAP"

Screenshot

NortonDiskDoublerPro-About.png

Software

Sample files

Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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