Editing Apple GS/OS (section)

====File System Translators====
GS/OS includes a facility known as file system translators (FSTs) which allows it to support multiple on-disk file systems in a manner transparent to application programs and to the user,<ref name="GS/OS Reference">{{cite book |url=http://asimov.applefritter.com/unsorted/GS%20OS%20REFERENCE%20MANUAL.pdf |title=Apple IIGS GS/OS Reference |chapter=File System Translators |publisher=Apple |date=1990 |isbn=0-201-55020-2}}</ref> a feature not found in ProDOS or most other microcomputer operating systems at the time. While GS/OS natively uses the ProDOS file system (from which it must be booted), it also fully supports [[Hierarchical File System (Apple)|HFS]] used by [[Classic Mac OS|Mac OS]]. Other file system translators include those for the [[MS-DOS]] [[File Allocation Table|FAT file system]],<ref>{{cite web |url=https://wiki.preterhuman.net/GS/OS_MS-DOS_File_System_Translator_External_ERS_(1992) |title=GS/OS MS-DOS File System Translator External ERS |date=1992}}</ref> [[ISO 9660|High Sierra/ISO 9660]],<ref name="GS/OS Reference" />{{rp|page=299}} Apple DOS 3.3, and [[Apple Pascal]],<ref>{{cite book |url=https://www.applefritter.com/files/Pascal%20File%20System%20Translator%20External%20ERS.pdf |title=Pascal File System Translator External ERS Version 1.00 a03}}</ref> albeit read-only (full read/write support had been planned but was never completed).