What Does High-Performance File System Mean?
The high-performance file system (HPFS) is a file system designed especially for the IBM OS/2. It is known for handling large files of up to 2 GB across multiple hard disks, as well as for handling long file names of up to 256 bytes. HPFS was designed to improve on the weaknesses of the file allocation table file system.
Techopedia Explains High-Performance File System
IBM agreed to collaborate with Microsoft so that both have rights to Windows and OS/2 technology. However, Microsoft still retains the rights to OS/2 technology and HPFS.