noun
High Sierra format; HSF
A file system format for CD-ROMs, standardized as ISO 9660. Technical computing term.
このCD-ROMはハイシエラフォーマットで記録されています。
This CD-ROM is recorded in High Sierra format.
Variant with interpuncts, sometimes used for clarity.
ISO 9660 is the international standard based on the High Sierra format; they are closely related but not identical.
From English 'High Sierra format', referring to the High Sierra Group that proposed the format.