<?xml version="1.0" encoding="utf-8"?>
<PRONOM-Report xmlns="http://pronom.nationalarchives.gov.uk">
  <report_format_detail>
    <FileFormat>
      <FormatID>1895</FormatID>
      <FormatName>FAT Disk Image</FormatName>
      <FormatVersion>
      </FormatVersion>
      <FormatAliases>
      </FormatAliases>
      <FormatFamilies>
      </FormatFamilies>
      <FormatTypes>Aggregate</FormatTypes>
      <FormatDisclosure>
      </FormatDisclosure>
      <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.</FormatDescription>
      <BinaryFileFormat>
      </BinaryFileFormat>
      <ByteOrders>
      </ByteOrders>
      <ReleaseDate>
      </ReleaseDate>
      <WithdrawnDate>
      </WithdrawnDate>
      <ProvenanceSourceID>225</ProvenanceSourceID>
      <ProvenanceName>National Library of Scotland / National Library of Scotland</ProvenanceName>
      <ProvenanceSourceDate>21 Aug 2017</ProvenanceSourceDate>
      <ProvenanceDescription>
      </ProvenanceDescription>
      <LastUpdatedDate>21 Aug 2017</LastUpdatedDate>
      <FormatNote>
      </FormatNote>
      <FormatRisk>
      </FormatRisk>
      <TechnicalEnvironment>
      </TechnicalEnvironment>
      <FileFormatIdentifier>
        <Identifier>fmt/1087</Identifier>
        <IdentifierType>PUID</IdentifierType>
      </FileFormatIdentifier>
      <ExternalSignature>
        <ExternalSignatureID>2096</ExternalSignatureID>
        <Signature>img</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <ExternalSignature>
        <ExternalSignatureID>2097</ExternalSignatureID>
        <Signature>ima</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <ExternalSignature>
        <ExternalSignatureID>2098</ExternalSignatureID>
        <Signature>dsk</Signature>
        <SignatureType>File extension</SignatureType>
      </ExternalSignature>
      <InternalSignature>
        <SignatureID>1468</SignatureID>
        <SignatureName>FAT Disk Image</SignatureName>
        <SignatureNote>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</SignatureNote>
        <ByteSequence>
          <ByteSequenceID>1727</ByteSequenceID>
          <PositionType>Absolute from BOF</PositionType>
          <Offset>0</Offset>
          <MaxOffset>0</MaxOffset>
          <IndirectOffsetLocation>
          </IndirectOffsetLocation>
          <IndirectOffsetLength>
          </IndirectOffsetLength>
          <Endianness>
          </Endianness>
          <ByteSequenceValue>EB{1}90{10}(01|02|04|08|10|20|40|80)</ByteSequenceValue>
        </ByteSequence>
      </InternalSignature>
      <RelatedFormat>
        <RelationshipType>Has lower priority than</RelationshipType>
        <RelatedFormatID>2436</RelatedFormatID>
        <RelatedFormatName>exFAT (Extensible File Allocation Table) Disc Image</RelatedFormatName>
        <RelatedFormatVersion>
        </RelatedFormatVersion>
      </RelatedFormat>
    </FileFormat>
    <SearchCriteria>Criteria</SearchCriteria>
  </report_format_detail>
</PRONOM-Report>
