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Virtual Allocation Table structure Offset Length Name Contents 0 2 Length of Header (=L_HD) Uint16 2 2 Length of Implementation Use (=L_IU) Uint16 4 128 Logical Volume Identifier dstringDstring 132 4 Previous VAT ICB location Uint32 136 4 Number of Files Uint32 140 4 Number of Directories Uint32 144 2 Minimum UDF Read VersionRevision Uint16 146 2 Minimum UDF Write VersionRevision Uint16 148 2 Maximum UDF Write VersionRevision Uint16 150 2 Reserved #00 bytes 152 L_IU Implementation Use bytes 152 + L_IU 4 VAT entry 0 Uint32 156 + L_IU 4 VAT entry 1 Uint32 … … … … Information Length - 4 4 VAT entry n Uint32 Length of Header - Indicates the amount of data preceding the VAT entries. This value shall be 152 + L_IU. Length of Implementation Use - Shall specify the number of bytes in the Implementation Use field. If this field is non-zero, the value shall be at least 32 and be an integral multiple of 4. Logical Volume Identifier - Shall identify the logical volume. This field shall be used by implementations instead of the corresponding field in the Logical Volume Descriptor. The value of this field should be the same as the field in the LVD until changed by the user. Previous VAT ICB Location - Shall specify the logical block number of an earlier VAT ICB in the partition identified by the partition map entry. If this field is #FFFFFFFF, no such ICB is specified. Number of Files – The current number of files in the associated Logical Volume. This information is needed by the Macintosh OS. All implementations shall maintain this information. Defined in 2.2.6.4. The contents of this field shall be used by implementations instead of the corresponding LVID field in the LVID. NOTE: This value does not include Extended Attributes or streams as part of the file count. UDF 2.01 37 March50 April
Number of Directories - The current number of directories in the associated Logical Volume. This information is needed by the Macintosh OS. All implementations shall maintain this informationDefined in 2.2.6.4. The contents of this field shall be used by implementations instead of the corresponding LVID field in the LVID. NOTE: The root directory shall be included in the directory count. The directory count does not include stream directories. Minimum UDF Read VersionRevision - Defined in 2.2.6.4. The contents of this field shall be used by implementations instead of the correspondingcorresponding LVID field in the Logical Volume Integrity Descriptor (LVID). Minimum UDF Write VersionRevision - Defined in 2.2.6.4. The contents of this field shall be used by implementations instead of the corresponding LVID field in the LVID. Maximum UDF Write VersionRevision - Defined in 2.2.6.4. The contents of this field shall be used by implementations instead of the corresponding LVID field in the LVID. Implementation Use - If non-zero in length, shall begin with an EntityID identifying the usage of the remainder of the Implementation Use area. VAT Entry - VAT entry n shall identify the logical block number of the virtual block n. An entry of #FFFFFFFF indicates that the virtual sector is currently unused. The LBN specified is located in the partition identified by the partition map entry. The number of entries in the table can be determined from the VAT file size in the ICB: Number of entries (N) = (Information Length - L_HD) / 4. 2.2.112.2.12 Sparing Table Certain disk/drive systems do not perform defect management (eg. CD-RW). A Sparing Table is used to provide an apparent defect-free space for these systems. Certain media can only be written in groups of sectors (“packets”), further complicating relocation: a whole packet must be relocated rather than only the sectors being written. To address this issue a sparable partition is identified in the partition map, which further identifies the location of the sparing tables. The sparing table identifies relocated areas on the media. Sparing tables are identified by a sparable partition map. Sparing tables shall not be recorded on disk/drive systems that perform defect management. Sparing Tables point to space allocated for sparing and contains a list of mappings of defective sectors to their replacements. Separate copies of the sparing tables shall be recorded in separate packets. All instances of the sparing table shall be kept up to date. Partitions map logical space to physical space. Normally, this is a linear mapping w<strong>here</strong> an offset and a length are specified. A sparable partition is based on this mapping, w<strong>here</strong> UDF 2.01 38 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 30 and 31: 2.2 Part 3 - Volume Structure 2.2.1
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 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 {
Page 82 and 83: would be considered writable if the
Page 84 and 85: 3.3.3.5 byte Extended Attributes Se
Page 86 and 87: ignored and the file creation time
Page 88 and 89: 3.3.4.5.1.1 FreeEASpace This extend
Page 90 and 91: MacVolumeInfo format RBP Length Nam
Page 92 and 93: 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
Page 134 and 135:
} 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
Page 172 and 173:
L Logical Block Size, 8, 9, 2425 Lo
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