HFS+

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File Format
Name HFS+
Ontology
Released 1998

HFS+ (also known as Mac OS Extended) is an Apple MacOS filesystem that is the successor to HFS, with some improvements, such as using a 32-bit file length field rather than 16 to allow much bigger files. It also supports Unicode characters in file names, which can be up to 255 characters long and which can contain any characters in the Unicode repertoire, though there may be OS or API-specific restrictions on allowable characters.

Contents

Identification

For the original HFS+ format, the ASCII signature "H+" appears at offset 1024 of a raw image file.

For the HFSX extension of HFS+, the signature is "HX".

Format documentation

Software

Sample files

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