{
  "fileFormatID": 1895,
  "formatName": "FAT Disk Image",
  "version": null,
  "formatDescription": "The File Allocation Table is a file system architecture used across a range of computer systems. This entry aims to capture instances where the file system has been exported as a portable disk image. It may be possible and desirable to distinguish between different types of FAT image. Please contact the PRONOM team if you can assist with this.",
  "releaseDate": null,
  "binaryFileFormat": null,
  "formatNote": null,
  "lastUpdatedDate": "21 Aug 2017",
  "formatProvenance": null,
  "formatSourceDate": "21 Aug 2017",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Aggregate",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "fmt/1087",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 1468,
      "name": "FAT Disk Image",
      "note": "BOF: Jump instruction bytes 1 and 3 - 0XEB{1}0x90, byte 14 = Sectors per cluster, any from 1, 2, 4, 8, 16, 32, 64, or 128",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": 0,
          "byteSequence": "EB{1}90{10}(01|02|04|08|10|20|40|80)",
          "endianness": null,
          "byteSequenceID": 1727
        }
      ],
      "provenance": "Based largely on https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system with reference to http://thestarman.pcministry.com/asm/mbr/DOS50FDB.htm"
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "img",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "ima",
      "signatureType": "File extension"
    },
    {
      "externalSignature": "dsk",
      "signatureType": "File extension"
    }
  ],
  "relationships": [
    {
      "relationshipType": "Has lower priority than",
      "relatedFormatID": 2436,
      "relatedFormatName": "exFAT (Extensible File Allocation Table) Disc Image",
      "relatedFormatPUID": "fmt/1609"
    }
  ],
  "submittedBy": [
    225
  ]
}