HFS is an acronym for Hierarchical File System. Files that contain the .hfs file extension are most commonly associated with Macintosh Disk Images that are stored on a CD. The file format was introduced by Apple in 1985 and was intended to support Apple's first hard disk drive for Macintosh computers.
The HFS file format was initially created for use on hard and floppy disks, although HFS files can also be found on read-only CD-ROMs. The HFS file format is commonly referred to as the Mac OS Standard.
The HFS file format has been increasingly replaced by the newer HFS Plus format, which is referred to as the Mac OS Extended standard.
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