Resource Fork

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Pre-OS X and some OS X Macintosh files have two forks: the data fork, and the [[resource fork]], which is subdivided into resources. Many file formats use the resource fork to store data, stored in [[Macintosh resource file]] format.
 
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Pre-OS X and some OS X Macintosh files have two forks: the data fork, and the resource fork, which is subdivided into resources. Many file formats use the resource fork to store data, stored in [[Macintosh resource file]] format.
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A resource has a four-character type code, an ID, and data. The type code is generally unique to the type of data stored within, but this may not be the case with application-specific formats.
 
A resource has a four-character type code, an ID, and data. The type code is generally unique to the type of data stored within, but this may not be the case with application-specific formats.

Revision as of 03:58, 24 October 2013

File Format
Name Resource Fork
Ontology

Pre-OS X and some OS X Macintosh files have two forks: the data fork, and the resource fork, which is subdivided into resources. Many file formats use the resource fork to store data, stored in Macintosh resource file format.

A resource has a four-character type code, an ID, and data. The type code is generally unique to the type of data stored within, but this may not be the case with application-specific formats.

Resource forks are usually invisible to the end-user on a Mac platform, but when Mac files are placed in a medium where users of other operating systems can see them (e.g., Windows), they are often visible as an additional subdirectory called resource.frk, or else a name with an underscore (_) as its first character (e.g., _MACOSX for OS X files) containing subdirectories and files that parallel the structure of the files they are associated with.

Later (Unix-based) Mac systems used AppleSingle and AppleDouble formats instead of the "classic" resource fork format when using filesystems not supporting direct use of resource forks. This usage continues in some OS X filesystems.

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