HFS

Not to be confused with HFS (IBM), a distinct IBM mainframe filesystem with the same name.

File Format
Name	HFS
Ontology	Electronic File Formats Filesystem HFS
Extension(s)	.hfs, .img
PRONOM	fmt/1105

HFS (Hierarchical File System), also known as Mac OS Standard format, is the native filesystem format of Apple's classic Mac OS operating system. It is the predecessor of HFS+.

Identification

The ASCII characters "BD" appear at offset 1024.

Specifications

• Information from Apple

Software

• Supported natively by classic Mac OS, OS X, macOS (read-only in newer versions).
• The Linux kernel optionally supports HFS (read+write).
• HFSExplorer
• hfsutils
• MacHFS python library
• 7-Zip [Ed. note: Claims to support HFS, but we've had no luck with it.]

Sample files

• https://archive.org/details/cdrom-golden-orchard-12 → GoldenOrchard1.2.iso (APM format) → Golden Orchard.hfs

Links

• Wikipedia article