HPFS386 is a ring 0 driver (allowing direct hardware access and direct interaction with the kernel) with built-in SMB networking properties that are usable by various server daemons, whereas HPFS is a ring 3 driver. HPFS386's cache is limited by the amount of available memory in OS/2's system memory arena and was implemented in 32-bit assembly language.

HPFS386 provided with certain server versions of OS/2, or as added component for the server versions that did not come with it.

The standard one with a cache limited to 2 MB.

IBM offers two kinds of IFS drivers for this file system: HPFS also can keep 64 KB of metadata (' extended attributes') per file.

Root directory located at the midpoint, rather than at the beginning of the disk, for faster average access.

Separate datestamps for last modification, last access, and creation (as opposed to last-modification-only datestamp in then-times implementations of FAT).

An internal architecture that keeps related items close to each other on the disk volume.

More efficient use of disk space (files are not stored using multiple-sector clusters but on a per-sector basis).

Support for long file names (255 characters as opposed to FAT's 8.3 naming scheme).

Support for mixed case file names, in different code pages.

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.Ĭompared with FAT, HPFS provided a number of additional capabilities:

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. OS/2, Windows NT, Linux, DragonFly BSD, eComStation, ArcaOS

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