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| Developer(s) | Microsoft, IBM |
|---|---|
| Full name | High Performance File System |
| Introduced | November 1989 with OS/2 1.2 |
| Partition IDs | 0x07 (MBR) |
| Structures | |
| Directory contents | B tree |
| File allocation | B+ tree |
| Bad blocks | List |
| Limits | |
| Max volume size | 64 GB (as implemented) 2 TB (theoretical) |
| Max file size | 2 GB |
| Max no. of files | Unlimited |
| Max filename length | 255 characters |
| Allowed filename characters | Single-byte from 0x20 to 0xFF |
| Features | |
| Dates recorded | Access, Creation, Modified |
| Forks | Yes |
| Attributes | Read-only, hidden, system, archive |
| File system permissions | Yes (only in HPFS386) |
| Transparent compression | No |
| Transparent encryption | No |
| Other | |
| Supported operating systems | OS/2, Windows NT, Linux, DragonFly BSD, eComStation, ArcaOS |
HPFS (High Performance File System) is a file system created specifically for the OS/2 operating system to improve upon the limitations of the FAT file system. It was written by Gordon Letwin and others at Microsoft and added to OS/2 version 1.2, at that time still a joint undertaking of Microsoft and IBM, and released in 1988.