Direct Access Archive: Difference between revisions

Direct Access Archive
Filename extension	.daa
Developed by	PowerISO Computing, Inc.
Type of format	Disk image

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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]

^ Text file in daa2iso: http://aluigi.altervista.org/mytoolz.htm#daa2iso
^ "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.
^ daa2iso application for Windows
^ DAA Converter for Mac OS X

External links[edit]

PowerISO Website

[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] 2iso application for Windows

[4] DAA Converter for Mac OS X

[1]

[2]

[3]

[4]

@@ Line 1: / Line 1: @@
-{{Refimprove|date=April 2008}}
-{{Weasel|date=March 2009}}
 {{Infobox file format
 | name = Direct Access Archive
@@ Line 13: / Line 11: @@
 | extendedto =
 }}
-'''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. Because of its proprietary nature, popular disk image [[Mount (computing)|mounting]] programs such as [[Alcohol 120%]] and [[Daemon Tools]] currently do not support the mounting of DAA images.
+'''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 [[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 [[PowerISO]] and [[MagicISO]].  Various free open source packages are also available to convert DAA to ISO images.
+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==
-Although lacking official documentation, DAA image files seem to be [[zlib|zlib-compressed]] [[ISO image]]s without any 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]].<ref>Text file in daa2iso: http://aluigi.altervista.org/mytoolz.htm</ref>
+Although lacking official documentation, DAA image files are [[zlib]]- or [[lzma]]-compressed [[ISO image]]s chunk by 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 you to extract DAA files or convert them into ISO format, however the tools haven't 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[http://www.poweriso.com/faq.htm], less than half of the capacity of a standard [[CD]].
+''PowerISO'' provides free command-line tools for [[Linux]] and [[Mac OS X]] which allow the user to extract DAA files or convert them into [[International Organization for Standardization|ISO]] format, however these tools have 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)
+''[[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.
-[http://www.aluigi.org/mytoolz.htm#daa2iso daa2iso] 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.  [http://groups.google.com/group/comp.sys.mac.apps/browse_thread/thread/7618aebd431ad6f6 A brief tutorial for using daa2iso is available here].
+''daa2iso''<ref>[http://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 .daa file, and the location for the .iso output via standard windows open and save dialogs
-For MacOS X , [http://www.twilightedge.com/mac/daaconverter/ DAA Converter] is a native GUI application which wraps the command-line tool, [http://www.aluigi.org/mytoolz.htm#daa2iso daa2iso], by  [http://www.aluigi.org/ Luigi Auriemma] (GNU license).
+For Mac OS X, ''DAA Converter''<ref>[http://www.twilightedge.com/mac/daaconverter/ DAA Converter for Mac OS X]</ref> is a GUI application which wraps the daa2iso command-line tool (GNU license).
-Graphical versions of daa2iso have also been made available for Windows and Mac OS X (see external links below).
 ==Features==
@@ Line 36: / Line 32: @@
 *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}}
@@ Line 51: / Line 43: @@
 [[Category:Disk images]]
 [[Category:Archive formats]]
-[[es:Daa]]
-[[it:Direct Access Archive]]
-[[pl:Direct Access Archive]]

v t e Disk image file formats
Comparison of disc image software
Optical discs	BIN+CUE DAA IMG+CCD+SUB ISO ISZ MDF+MDS MDX NRG UIF
Hard disks	DMG FVD IMG ISO NDIF QCOW UDIF VDI VHD VMDK WIM
Floppy disks	ADF, ADZ DC42, DART DMS IMG, IMA, IMZ VFD
CD-DA	Disc Description Protocol
Convention: Any item in this table that has the form of "A+B" or "A+B+C" indicates a disk format that spans multiple files, where A contains the bulk of the data, and B and C are sidecar files.