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ISO 9660 converted to UDF 1 st session 2 nd session 3 rd session 9660 Session 9660 Session UDF Session Written by conventional 9660 formatter software Managed by UDF Foreign format converted to UDF 1 st session 2 nd session 3 rd session Data Session Data Session UDF Session Written by another file system Managed by UDF 6.11 Real-Time Files A Real-Time file is a file that requires a minimum data-transfer rate when writing or reading, for example, audio and video data. For these files special read and write commands are needed. For example for CD and DVD devices these special commands can be found in the Mount Fuji 4 specification. A Real-Time file shall be identified by file type 249 in the File Type field of the file's ICB Tag. UDF 2.01 147 March50 April
6.12 Requirements for DVD-R/-RW/RAM interchangeability This appendix defines the requirements and restrictions on volume and file structures for writable DVD media, including but not limited to DVD-RAM discs (6.12.1), DVD-RW discs (6.12.2) and DVD-R discs (6.12.3), to support the interchange of information between users of both computer systems and consumer appliances. These requirements do not apply to the discs that are used in a computer system environment only and have no interchangeability with consumer appliances. The common requirements for these DVD discs are summarized as follows: 1. The volume and file structure shall comply with UDF 2.00. 2. The Minimum UDF Read Revision and Minimum UDF Write Revision shall be 2.00. 3. The length of logical sector and logical block shall be 2048 bytes. 4. A Main Volume Descriptor Sequence and a Reserve Volume Descriptor Sequence shall be recorded. 6.12.1 Requirements for DVD-RAM The requirements for DVD-RAM discs are based on UDF 2.00. The volume and file structure is simplified as for overwritable discs using non-sequential recording. For Volume Structure: 1. A partition on a DVD-RAM disc shall be an overwritable partition specified as access type 4. 2. Virtual Partition Map and Virtual Allocation Table shall not be recorded. 3. Sparable Partition Map and Sparing Table shall not be recorded. For File Structure: 4. Unallocated Space Table or Unallocated Space Bitmap shall be used to indicate a space set. Freed Space Table and Freed Space Bitmap shall not be recorded. 5. Non-Allocatable Space Stream shall not be recorded. 6.12.2 Requirements for DVD-RW The requirements for DVD-RW discs under Restricted Overwrite mode are based on UDF 2.00. The volume and file structure is simplified as for rewritable discs using nonsequential recording. For Volume Structure: 1. A disc shall consist of a single volume with a single sparable partition per side. 2. A Sparable Partition Map and Sparing Table shall be recorded. 3. Length of a packet shall be 16 sectors (32 KB) and the first sector number of a packet shall be an integral multiple of 16. 4. Virtual Partition Map and Virtual Allocation Table shall not be recorded. UDF 2.01 148 March50 April
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Universal Disk Format ® Specificat
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REVISION HISTORY 1.00 October 24, 1
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CONTENTS 1. INTRODUCTION ..........
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6.4 OSTA Compressed Unicode Algorit
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1. Introduction The OSTA Universal
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1.2 Compliance This document requir
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Media Block Address NOTE 1: This is
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1.3.3 Terms May Optional Shall Shou
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non-overlapping Partitions with 2 p
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2.1 Part 1 - General 2.1.1 Characte
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length of the field. The characters
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2.1.5.2 char Identifier[23] Unless
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The Suffix Type column in the above
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For an Application Entity Identifie
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2.2 Part 3 - Volume Structure 2.2.1
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NOTE: This field is used to determi
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2.2.4 Logical Volume Descriptor str
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2.2.5 Unallocated Space Descriptor
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EntityID. The scope of this EntityI
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2.2.7.2.2 dstring LogicalVolumeIden
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Layout of Type 2 partition map for
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• Bits 1-7: Reserved. Shall be se
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Virtual Allocation Table structure
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the offset and length of a partitio
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The Metadata Partition Map (see2.2.
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2.2.13.1 Metadata File (and Metadat
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2.2.13.4 Procedure for de-allocatin
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} struct EntityID byte byte Impleme
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2.3.2 File Set Descriptor struct Fi
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2.3.2.7 struct EntityID DomainIdent
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In order to assist a UDF implementa
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2.3.5.1 Uint16 StrategyType The co
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2.3.6 File Entry struct FileEntry {
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2.3.6.8 FileLinkCount Hard links to
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Descriptors should be used. For exa
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2.3.11.2 Uint32 PreviousAllocationE
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3.2 Part 3 - Volume Structure 3.2.1
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3.3 Part 4 - File System 3.3.1 File
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3.3.2.1.2 Macintosh Bits 6 & 7 (Set
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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
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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
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The ApplicationUse area for this ex
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stream directory. If present, there
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Since the streams listed above have
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Object Logical Block Number is the
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mechanism for the host software to
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Vendor ID - The Vendor ID reported
Page 106 and 107: The OS2EA Stream contains a table o
Page 108 and 109: 4.2.2 File Identifier Descriptor st
Page 110 and 111: Definitions: A FileIdentifier shall
Page 112 and 113: 3. Invalid Characters: A FileIdenti
Page 114 and 115: 4. Trailing Periods and Spaces: All
Page 116 and 117: If there is a file extension then t
Page 118 and 119: defined as space that is not direct
Page 120 and 121: UDF 2.01 111 March50 April
Page 122 and 123: 6.2 UDF Entity Identifier Values En
Page 124 and 125: 8 0 BeOS - generic 9 0 Windows CE -
Page 126 and 127: } } returnValue = unicodeIndex; } r
Page 128 and 129: } return crc; #ifdef MAIN unsigned
Page 130 and 131: 6.6 Algorithm for Strategy Type 409
Page 132 and 133: nameLen = udfNameLen; } else { /* A
Page 134 and 135: } needsCRC = TRUE; /* Append the CR
Page 136 and 137: if (index < udfLabelLen || index ==
Page 138 and 139: UDF 2.01 129 March50 April
Page 140 and 141: unicode_t *udfName, /* (Input) Name
Page 142 and 143: } #ifdef (OS2 | WIN_95 | WIN_NT) /*
Page 144 and 145: 6.8 Extended Attribute Checksum Alg
Page 146 and 147: • The data of each file shall be
Page 148 and 149: Read the File Identifier Descriptor
Page 150 and 151: • An intermediate state is allowe
Page 152 and 153: • The host shall perform read/mod
Page 154 and 155: 6.10.2.6.3 Level 3 No restrictions
Page 158 and 159: For File Structure: 5. Unallocated
Page 160 and 161: 6.13 Recommendations for DVD+R and
Page 162 and 163: 6.13.1.4.2 Anchor Volume Descriptor
Page 164 and 165: 6.13.2.1 Requirements • The packe
Page 166 and 167: 6.126.15 UDF Media Format Revision
Page 168 and 169: Description DCN Updated in UDF Revi
Page 170 and 171: Registration Form Disk Format Speci
Page 172 and 173: L Logical Block Size, 8, 9, 2425 Lo
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