HFS Plus also uses a full 32-bit allocation mapping table rather than HFS's 16 bits, improving the use of space on large disks.Ĭodenamed Sequoia in development, HFS+ was introduced with the January 19, 1998, release of Mac OS 8.1. HFS Plus permits filenames up to 255 characters in length, and n-forked files similar to NTFS, though until 2005 almost no system software took advantage of forks other than the data fork and resource fork.

Like HFS, HFS Plus uses B-trees to store most volume metadata, but unlike most file systems that support hard links, HFS Plus supports hard links to directories. HFS+ is also one of the formats supported by the iPod digital music player.Ĭompared to its predecessor HFS, also called Mac OS Standard or HFS Standard, HFS Plus supports much larger files (block addresses are 32-bit length instead of 16-bit) and using Unicode (instead of Mac OS Roman or any of several other character sets) for naming items.

HFS+ continued as the primary Mac OS X file system until it was itself replaced with the Apple File System (APFS), released with macOS High Sierra in 2017. It replaced the Hierarchical File System (HFS) as the primary file system of Apple computers with the 1998 release of Mac OS 8.1. HFS Plus or HFS+ (also known as Mac OS Extended or HFS Extended) is a journaling file system developed by Apple Inc. Mac OS 8.1, Mac OS 9, macOS/ iOS/ tvOS/ watchOS/ Darwin, Linux, Microsoft Windows (through Boot Camp IFS drivers) dmg volumes on OS X versions prior to 10.7 but later than Mac OS X 10.3 Per- home directory encryption is available with AES using HFS+-formatted. Partial (decmpfs, on Mac OS X 10.6 and higher)

Unix permissions, NFSv4 ACLs ( Mac OS X v10.4 onward) OS APIs may limit some characters for legacy reasonsĪccess, attributes modified, backed up, contents modified, createdĬolor (3 bits, all other flags 1 bit), locked, custom icon, bundle, invisible, alias, system, stationery, inited, no INIT resources, shared, desktop January 19, 1998 25 years ago ( ) with Mac OS 8.1Īpple_HFSX ( Apple Partition Map) when HFSXĢ55 characters (255 UTF-16 encoding units, normalized to Apple-modified variant of Unicode Normalization Format D) Journaling file system developed by Apple HFS+ Developer(s)

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