Apple File System
| Developer(s) | Apple Inc. |
|---|---|
| Full name | Apple File System |
| Introduced |
|
| Preceded by | HFS Plus |
| Partition IDs | 7C3457EF-0000-11AA-AA11-00306543ECAC (GPT) |
| Structures | |
| Directory contents | B-tree |
| Limits | |
| Max file size | 8 Exabyte (9,223,372,036,854,775,808 bytes) |
| Max no. of files | 9,223,372,036,854,775,808 |
| Allowed filename characters | Unicode 9.0 encoded in UTF-8[A] |
| Features | |
| Dates recorded | access, attributes modified, contents modified, created |
| Date range | January 1, 1970 – July 21, 2554 |
| Date resolution | 1 nanosecond |
| File system permissions | Unix permissions, NFSv4 ACLs |
| Transparent compression | Partial (decmpfs) |
| Transparent encryption | Yes |
| Copy-on-write | Yes |
| Other | |
| Supported operating systems | macOS, iPadOS, iOS, tvOS, watchOS |
Apple File System (APFS) is a proprietary file system developed and deployed by Apple Inc. for macOS Sierra (10.12.4) and later, iOS 10.3, tvOS 10.2, watchOS 3.2, and all versions of iPadOS. It aims to fix core problems of HFS+ (also called Mac OS Extended), APFS's predecessor which had been in use since 1998. APFS is optimized for solid-state drive storage and supports encryption, snapshots, and improved handling of metadata integrity.