The Disc Filing System (DFS) is a computer file system developed by Acorn Computers Ltd, and introduced in 1982 for the Acorn BBC Microcomputer. It shipped as a ROM to be inserted onto the BBC Micro's motherboard. It has an extremely limited design in order to make best use of the 100 KiB single density floppy discs it was originally designed for.

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p:abstract
  • The Disc Filing System (DFS) is a computer file system developed by Acorn Computers Ltd, and introduced in 1982 for the Acorn BBC Microcomputer. It shipped as a ROM to be inserted onto the BBC Micro's motherboard. It has an extremely limited design in order to make best use of the 100 KiB single density floppy discs it was originally designed for. It uses a flat directory structure. Each filename can be up to 7 letters long, plus one letter for the directory in which the file is stored. The DFS is remarkable in that unlike most filing systems, there was no single vendor or implementation. The original DFS was written by Acorn, who continued to maintain their own codebase, but various disc drive vendors wrote their own implementations. Companies who wrote their own DFS implementation included Cumana, Opus and Watford Electronics. The Watford Electronics implementation is notable for supporting 62 files per disc instead of the usual 31, using a non-standard disc format. Other features in third-party implementations included being able to review free space, and in-built FORMAT and VERIFY commands, which shipped on a utility disc with the original Acorn DFS. Acorn followed up their original DFS series with the Acorn 1770 DFS, which used the same disc format as the earlier version but added a set of extra commands and supported the improved WD1770 floppy drive controller chip. (en)
p:attributes
  • Directory character, Load address, Execution address, Locked (en)
p:badBlocksStruct
  • None (en)
p:compression
  • No (en)
p:dateRange
  • N/A (en)
p:datesRecorded
  • None (en)
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p:directoryStruct
  • Single catalogue of 31 fixed length records (en)
p:encryption
  • No (en)
p:fileStruct
  • Start-Length entries (en)
p:fileSystemPermissions
  • No (en)
p:filenameCharacterSet
  • ASCII (en)
p:forksStreams
  • No (en)
p:fullName
  • Disc Filing System (en)
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p:introductionDate
  • 1982-01-01 00:00:00.000000 (xsd:date)
p:introductionOs
p:maxFileSize
  • 256 (xsd:integer)
p:maxFilenameSize
  • 7 characters (en)
p:maxFilesNo
  • 31 (xsd:integer)
p:maxVolumeSize
  • 256 (xsd:integer)
p:name
  • DFS (en)
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p:partitionId
  • None (en)
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rdfs:comment
  • The Disc Filing System (DFS) is a computer file system developed by Acorn Computers Ltd, and introduced in 1982 for the Acorn BBC Microcomputer. It shipped as a ROM to be inserted onto the BBC Micro's motherboard. It has an extremely limited design in order to make best use of the 100 KiB single density floppy discs it was originally designed for. (en)
rdfs:label
  • Disc Filing System (en)
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