High Sierra Format (HSF) is the early logical file system used for CD-ROMs. The ISO 9660 standard is based on revised HSF.

The HSF standard was created in October 1985. Then representatives of 12 computer hardware manufacturers gathered at Del Webb's High Sierra Hotel near Lake Tahoe, California. This group became known as the High Sierra Group.

  • Apple Computer
  • Digital Equipment Corporation (DEC)
  • Hitachi
  • LaserData
  • Microsoft
  • 3M
  • Philips
  • Reference Technology Inc.
  • Sony Corporation
  • TMS Inc.
  • VideoTools