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{{Refimprove|date=April 2008}}
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{{Infobox file format
| name = Direct Access Archive
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'''Direct Access Archive''', or '''DAA''', is a proprietary file format developed by [[PowerISO|PowerISO Computing]] for [[disk image]] files. The format supports features such as compression, password protection, and splitting to multiple volumes. BecausePopular of its proprietary nature, popularWindows disk image [[Mount (computing)|mounting]] programs such as [[Alcohol 120%]] and [[Daemon Tools]] currently do not support the mounting of DAA images; Linux and BSD also do not support mounting images of this kind.
 
Currently there is no published information about the format. Among mainstream applications, it can be opened or converted with [[PowerISOMagicISO]] and [[MagicISOUltraISO]]. Various free openand open-source packages are also available to convert DAA to ISO images.
 
==File Structure==
Although lacking official documentation, DAA image files seemare to[[zlib]]- beor [[zlib|zliblzma]]-compressed]] [[ISO image]]s withoutchunk anyby added functionality in comparison to ISO. It thus offers no advantage to a zipped ISO image and can be considered a case of [[vendor lock-in]]chunk.<ref>Text file in daa2iso: http://aluigi.altervista.org/mytoolz.htm#daa2iso</ref>
 
== Conversion ==
==Converting into a Proper Format==
''PowerISO'' provides free command-line tools for [[Linux]] and [[Mac OS X]] which allow youthe user to extract DAA files or convert them into [[International Organization for Standardization|ISO]] format, however thethese tools haven'thave not been updated to support the newest version of the DAA format. The PowerISO [[Microsoft Windows|Windows]] trial version only supports converting images from DAA files up to 300MB[,<ref>{{Cite web |url=http://www.poweriso.com/faq.htm] |title=PowerISO - Create, Edit, Extract, Mount, Compress, Encrypt, Split ISO file, ISO/BIN converter, Virtual Drive, DAA |access-date=2008-04-18 |archive-url=https://web.archive.org/web/20080512001322/http://www.poweriso.com/faq.htm |archive-date=2008-05-12 |url-status=dead }}</ref> less than half of the capacity of a standard [[CD]].
 
''[[AcetoneISO]]'' is a free CD/DVD management application for Linux that can convert DAA to ISO (with the help of the external PowerISO command-line tool for Linux).
 
''daa2iso''<ref>[http://www.aluigi.altervista.org/mytoolz.htm#daa2iso daa2iso application for Windows]</ref> is an open source [[command line]] application has been developed to convert DAA files to ISO files. The program comes with a Windows binary and source code which compiles under Unix-like operating systems. daa2iso allows users to select the [http://groups.google.com/group/comp.sys.mac.apps/browse_thread/thread/7618aebd431ad6f6daa Afile, briefand tutorialthe location for usingthe daa2iso.iso isoutput availablevia here].standard windows open and save dialogs
 
For MacOSMac XOS X, ''DAA Converter''<ref>[http://www.twilightedge.com/mac/daaconverter/ DAA Converter for Mac OS X]</ref> is a native GUI application which wraps the daa2iso command-line tool, [http://www.aluigi.org/mytoolz.htm#daa2iso daa2iso], by [http://www.aluigi.org/ Luigi Auriemma] (GNU license).
 
Graphical versions of daa2iso have also been made available for Windows and Mac OS X (see external links below).
 
==Features==
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*Can be password protected
*Can be split into multiple smaller files
 
==References==
{{Reflist}}
 
==External links==
*[http://www.poweriso.com/ PowerISO Website]
*[http://www.poweriso.com/download.htm PowerISO downloads for Windows Linux and Mac OS X]
====Related Utilities====
*[http://aluigi.altervista.org/mytoolz.htm daa2iso application for Windows] (source code included, and may be compiled for *nix / MacOSX without modification)
*[http://www.twilightedge.com/mac/daaconverter/ DAA Converter for Mac OS X], graphical Mac interface for daa2iso
 
==References==
{{Reflist}}
 
{{Disk_images}}
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[[Category:Disk images]]
[[Category:Archive formats]]
 
[[es:Daa]]
[[it:Direct Access Archive]]
[[pl:Direct Access Archive]]

Latest revision as of 22:07, 23 August 2022

Direct Access Archive
Filename extension
.daa
Developed byPowerISO Computing, Inc.
Type of formatDisk image

Direct Access Archive, or DAA, is a proprietary file format developed by PowerISO Computing for disk image files. The format supports features such as compression, password protection, and splitting to multiple volumes. Popular Windows disk image mounting programs such as Alcohol 120% and Daemon Tools currently do not support the mounting of DAA images; Linux and BSD also do not support mounting images of this kind.

Currently there is no published information about the format. Among mainstream applications, it can be opened or converted with MagicISO and UltraISO. Various free and open-source packages are also available to convert DAA to ISO images.

File Structure[edit]

Although lacking official documentation, DAA image files are zlib- or lzma-compressed ISO images chunk by chunk.[1]

Conversion[edit]

PowerISO provides free command-line tools for Linux and Mac OS X which allow the user to extract DAA files or convert them into ISO format, however these tools have not been updated to support the newest version of the DAA format. The PowerISO Windows trial version only supports converting images from DAA files up to 300MB,[2] less than half of the capacity of a standard CD.

AcetoneISO is a free CD/DVD management application for Linux that can convert DAA to ISO with the help of the external PowerISO command-line tool for Linux.

daa2iso[3] is an open source command line application has been developed to convert DAA files to ISO files. The program comes with a Windows binary and source code which compiles under Unix-like operating systems. daa2iso allows users to select the .daa file, and the location for the .iso output via standard windows open and save dialogs

For Mac OS X, DAA Converter[4] is a GUI application which wraps the daa2iso command-line tool (GNU license).

Features[edit]

Due to using freely available compression algorithms, DAA includes the following features that are absent in ISO (but can be obtained by manually compressing ISO files):

  • Ability to compress images, thus saving space and allowing smaller downloads
  • Can be password protected
  • Can be split into multiple smaller files

References[edit]

  1. ^ Text file in daa2iso: http://aluigi.altervista.org/mytoolz.htm#daa2iso
  2. ^ "PowerISO - Create, Edit, Extract, Mount, Compress, Encrypt, Split ISO file, ISO/BIN converter, Virtual Drive, DAA". Archived from the original on 2008-05-12. Retrieved 2008-04-18.
  3. ^ daa2iso application for Windows
  4. ^ DAA Converter for Mac OS X

External links[edit]