HPFS (High Performance File System)

Contributor(s): Steven Choy

HPFS (High Performance File System) is the file system introduced with IBM's OS/2 Version 1.2. HPFS is noted for handling large files (2 gigabytes) across multiple hard disk volumes (addressable up to 2 terabytes) and long file names (up to 256 bytes). HPFS was designed to get around several limitations at the time in MS-DOS, among them its eight-character name restriction. HPFS uses a centrally-located root directory and B-tree lookup to speed access. HPFS can coexist with the MS-DOS file system, File Allocation Table (FAT), or run independently.

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Among the benefits of HPFS:

  • Contiguous storage of extended attributes (without the EA DATA.SF file used by FAT)
  • Resistance to file fragmentation
  • Small cluster size
  • Support for larger file storage devices (up to 512 GB)
  • Speedier disk operation

Among the drawbacks:

  • Requires more system memory
  • HPFS partitions are not visible to MS-DOS, so if you need to boot from a floppy disk, it could be inconvenient.
  • Native DOS needs a special utility (Partition Magic from PowerQuest) to access a HPFS partition
This was last updated in September 2005

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