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(Hierarchical File System) The previous file system in the Mac, which was replaced with the Apple File System (see APFS). The first version of HFS, known as "Mac OS Standard," was introduced in 1985. HFS+ ("Mac OS Extended") came out in 1998 in preparation for Mac OS X, featuring Unicode support and a dramatically increased file size from 2GB to 16TB. In 2003, journaling was added (see journaling file system), and case-sensitive file names were introduced under the HFSX option. Case-sensitive names are a standard feature of Unix, and Mac OS X is based on Unix (see Mac OS X).

Data and Resource Forks
The design of HFS departed from other file systems of that day with support for two types of structures: the "data fork" and "resource fork." The data fork is like other file system structures. Data are accessed by an offset into the file; for example: OPEN FILE and READ FROM BYTE 13,904.

The resource fork functions like a mini-database, holding executable code and program structures such as icons, menus and sounds. Instead of storing an executable program as a monolithic block, having the program's resources in separate structures allows them to be edited independently and more easily localized into different languages. In addition, data files can use the two forks with the resource fork acting as a sub-file system. For example, a word processor would naturally have its text in the data fork, but could store images in the resource fork. See APFS, file system and hierarchical file system.
References in periodicals archive ?
After the initial HFS mock code intervention, group performance was reviewed in a debriefing.
Recognizing that humans are flawed creatures, the HFS would aid raters in developing a more complete picture of their subordinates' performance.
The mean age was 45.3 [+ or -] 9.6 years (16 female, 8 male) for the cases with HFS and 44.4 [+ or -] 9.7 years (16 female, 9 male) for the control group (p = 0.77).
The aim of this study was to evaluate if OT students who received HFS training scored higher during Level II FW placements than students who did not receive this training.
In terms of new job creation as a result of automation, based on the bases of make up of the workforces, education levels and future anticipated IT/business services work for enterprises HfS expects India will add 160,000 (14% growth) in mid/high value skills value chain.
Davis, Kimble, and Gunby (2014) conducted a mixed-methods (qualitative and quantitative) study that indicated nursing programs are using a high percentage of HFS, but the literature on this topic is generally vague.
Before joining Scottish Futures Trust in 2012, Barclay spent two years as a planning advisor with HFS. She had originally joined the trade body from Macfarlane Homes.
Interestingly, we did not find evidence that HFS exposure influenced prudent diet scores of women or that fast-food outlets exposure influenced Western diet scores differentially as a function of diet knowledge.
GE Capital's Healthcare Financial Services (HFS) business is one of the most active capital providers in the U.S.
Chris Lloyd, Managing director of Lloyd Helicopters, will join Amur as the President of Amur HFS Asia.
The Multi-tower HRO Blueprint Report is the first application of HfS Blueprint methodology on the human resources (HR) business function.
High-fidelity simulation (HFS) is an educational method that has been used to provide experiential and reflective learning in an environment free from patient harm (Jeffries, 2005; Kim, Neilipovitz, Cardinal, Chiu, & Clich, 2006; Murray et al., 2007; Steadman et al., 2006).