This was a result from the Microsoft and IBM collaboration that both IBM and Microsoft had right to use Windows and OS/2 technology. Though IBM still had rights to HPFS, their agreement with Microsoft to continue licensing the HPFS386 version is contingent upon them paying Microsoft a licensing fee for each copy sold. It is also highly tunable by experienced administrators. Thus, HPFS386 is faster than HPFS and highly optimized for server applications. HPFS386 is a ring 0 driver (allowing it direct hardware access and direct interaction with the kernel) with built-in SMB networking properties that are utilizable 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 MiB.IBM offers two kind of IFS drivers for this file system: HPFS also can keep 64 KiB of metadata (" extended attributes") per file. root directory located at the midpoint, rather than beginning of the disk, for faster average access.separate datestamps for last modification, last access, and creation (as opposed to FAT's last modification-only datestamp).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 characters).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. HPFS or 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.
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