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2.2 Part 3 - Volume Structure 2.2.1 Descriptor Tag struct tag { /* ECMA 167 3/7.2 */ Uint16 TagIdentifier; Uint16 DescriptorVersion; Uint8 TagChecksum; byte Reserved; Uint16 TagSerialNumber; Uint16 DescriptorCRC; Uint16 DescriptorCRCLength; Uint32 TagLocation; } 2.2.1.1 Uint16 TagSerialNumber Ignored. Intended for disaster recovery. Shall be set to the TagSerialNumber value of the Anchor Volume Descriptor Pointers on this volume. In order to preserve disaster recovery support, the TagSerialNumber must be set to a value that differs from ones previously recorded, upon volume re-initialization. This value is determined at volume formatting time and may depend on the state of the volume prior to formatting. See 2.1.6 for further details. 2.2.1.2 Uint16 DescriptorCRCLength CRCs shall be supported and calculated for each descriptor. The value of this field shall be set to (Size of the Descriptor) - (Length of Descriptor Tag). When reading a descriptor the CRC should be validated. NOTE: The DescriptorCRCLength field must not be used to determine the actual length of the descriptor or the number of bytes to read. These lengths do not match in all cases; t<strong>here</strong> are exceptions in the standard w<strong>here</strong> the Descriptor CRC Length need not match the length of the descriptor. UDF 2.01 21 March50 April
2.2.2 Primary Volume Descriptor struct PrimaryVolumeDescriptor { /* ECMA 167 3/10.1 */ struct tag DescriptorTag; Uint32 VolumeDescriptorSequenceNumber; Uint32 PrimaryVolumeDescriptorNumber; dstring VolumeIdentifier[32]; Uint16 VolumeSequenceNumber; Uint16 MaximumVolumeSequenceNumber; Uint16 InterchangeLevel; Uint16 MaximumInterchangeLevel; Uint32 CharacterSetList; Uint32 MaximumCharacterSetList; dstring VolumeSetIdentifier[128]; struct charspec DescriptorCharacterSet; struct charspec ExplanatoryCharacterSet; struct extent_ad VolumeAbstract; struct extent_ad VolumeCopyrightNotice; struct EntityID ApplicationIdentifier; struct timestamp RecordingDateandTime; struct EntityID ImplementationIdentifier; byte ImplementationUse[64]; Uint32 PredecessorVolumeDescriptorSequenceLocation; Uint16 Flags; byte Reserved[22]; } 2.2.2.1 Uint16 InterchangeLevel Interpreted as specifying the current interchange level (as specified in ECMA 167 3/11), of the contents of the associated volume and the restrictions implied by the specified level. If this volume is part of a multi-volume Volume Set then the level shall be set to 3, otherwise the level shall be set to 2. ECMA 167 requires an implementation to enforce the restrictions associated with the specified current Interchange Level. The implementation may change the value of this field as long as it does not exceed the value of the Maximum Interchange Level field. 2.2.2.2 Uint16 MaximumInterchangeLevel Interpreted as specifying the maximum interchange level (as specified in ECMA 167 3/11), of the contents of the associated volume. This field shall be set to level 3 (No Restrictions Apply), unless specifically given a different value by the user. UDF 2.01 22 March50 April
Page 1 and 2: Universal Disk Format ® Specificat
Page 3 and 4: REVISION HISTORY 1.00 October 24, 1
Page 6 and 7: CONTENTS 1. INTRODUCTION ..........
Page 8 and 9: 6.4 OSTA Compressed Unicode Algorit
Page 10 and 11: 1. Introduction The OSTA Universal
Page 12 and 13: 1.2 Compliance This document requir
Page 14 and 15: Media Block Address NOTE 1: This is
Page 16 and 17: 1.3.3 Terms May Optional Shall Shou
Page 18 and 19: non-overlapping Partitions with 2 p
Page 20 and 21: 2.1 Part 1 - General 2.1.1 Characte
Page 22 and 23: length of the field. The characters
Page 24 and 25: 2.1.5.2 char Identifier[23] Unless
Page 26 and 27: The Suffix Type column in the above
Page 28 and 29: For an Application Entity Identifie
Page 32 and 33: NOTE: This field is used to determi
Page 34 and 35: 2.2.4 Logical Volume Descriptor str
Page 36 and 37: 2.2.5 Unallocated Space Descriptor
Page 38 and 39: EntityID. The scope of this EntityI
Page 40 and 41: 2.2.7.2.2 dstring LogicalVolumeIden
Page 42 and 43: Layout of Type 2 partition map for
Page 44 and 45: • Bits 1-7: Reserved. Shall be se
Page 46 and 47: Virtual Allocation Table structure
Page 48 and 49: the offset and length of a partitio
Page 50 and 51: The Metadata Partition Map (see2.2.
Page 52 and 53: 2.2.13.1 Metadata File (and Metadat
Page 54 and 55: 2.2.13.4 Procedure for de-allocatin
Page 56 and 57: } struct EntityID byte byte Impleme
Page 58 and 59: 2.3.2 File Set Descriptor struct Fi
Page 60 and 61: 2.3.2.7 struct EntityID DomainIdent
Page 62 and 63: In order to assist a UDF implementa
Page 64 and 65: 2.3.5.1 Uint16 StrategyType The co
Page 66 and 67: 2.3.6 File Entry struct FileEntry {
Page 68 and 69: 2.3.6.8 FileLinkCount Hard links to
Page 70 and 71: Descriptors should be used. For exa
Page 72 and 73: 2.3.11.2 Uint32 PreviousAllocationE
Page 74 and 75: 3.2 Part 3 - Volume Structure 3.2.1
Page 76 and 77: 3.3 Part 4 - File System 3.3.1 File
Page 78 and 79: 3.3.2.1.2 Macintosh Bits 6 & 7 (Set
Page 80 and 81:
3.3.3 File Entry struct FileEntry {
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would be considered writable if the
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3.3.3.5 byte Extended Attributes Se
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ignored and the file creation time
Page 88 and 89:
3.3.4.5.1.1 FreeEASpace This extend
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MacVolumeInfo format RBP Length Nam
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UDFFXInfo format (Volume IV, page 1
Page 94 and 95:
The ApplicationUse area for this ex
Page 96 and 97:
stream directory. If present, there
Page 98 and 99:
Since the streams listed above have
Page 100 and 101:
Object Logical Block Number is the
Page 102 and 103:
mechanism for the host software to
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Vendor ID - The Vendor ID reported
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The OS2EA Stream contains a table o
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4.2.2 File Identifier Descriptor st
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Definitions: A FileIdentifier shall
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3. Invalid Characters: A FileIdenti
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4. Trailing Periods and Spaces: All
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If there is a file extension then t
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defined as space that is not direct
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UDF 2.01 111 March50 April
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6.2 UDF Entity Identifier Values En
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8 0 BeOS - generic 9 0 Windows CE -
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} } returnValue = unicodeIndex; } r
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} return crc; #ifdef MAIN unsigned
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6.6 Algorithm for Strategy Type 409
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nameLen = udfNameLen; } else { /* A
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} needsCRC = TRUE; /* Append the CR
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if (index < udfLabelLen || index ==
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UDF 2.01 129 March50 April
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unicode_t *udfName, /* (Input) Name
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} #ifdef (OS2 | WIN_95 | WIN_NT) /*
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6.8 Extended Attribute Checksum Alg
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• The data of each file shall be
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Read the File Identifier Descriptor
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• An intermediate state is allowe
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• The host shall perform read/mod
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6.10.2.6.3 Level 3 No restrictions
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ISO 9660 converted to UDF 1 st sess
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For File Structure: 5. Unallocated
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6.13 Recommendations for DVD+R and
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6.13.1.4.2 Anchor Volume Descriptor
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6.13.2.1 Requirements • The packe
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6.126.15 UDF Media Format Revision
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Description DCN Updated in UDF Revi
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Registration Form Disk Format Speci
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L Logical Block Size, 8, 9, 2425 Lo
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