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6.13.2.1 Requirements • The packet length shall be 16 sectors (32 KB). • Defective packets known at format time shall be allocated by the Non-Allocatable Space Stream (see 3.3.7.2). • Sparing shall be managed by the host via the sparable partition and a sparing table. 6.13.2.2 Background Physical Formatting Physical formatting is performed by the drive in background. In implementing the host applications, the following requirements for the drive should be considered: • After some minimal amount of formatting has been performed, the operation continues in background. • At the initialization of the file system, after the Background Physical Formatting has been started, the host must record the first AVDP at sector 256. The second AVDP must be recorded after the Background physical Formatting has been finished. Before the second AVDP has been recorded, the file system is in an intermediate state and is not strictly in compliance with ECMA 167. The disc can be ejected before the background formatting has finished, and in that case only one AVDP exists. Note that at an early eject the drive must format all non-recorded areas up to the highest sector number recorded by the host, this could cause a significant delay in the early eject process. Implementations are recommended to allocate the lowest numbered blocks available while background physical formatting is in progress. • The background physical formatting status shall not influence the recording of the LVID. At early eject the LVID shall be recorded in the same way as it will be recorded on rewritable media that do not support background physical formatting. The physical formating may be followed by a verification pass. Defects found during the verification pass shall be enumerated in the Non-Allocatable Space Stream, see 3.3.7.2. Finally, file system root structures shall be recorded. These mandatory file system and root structures include the Volume Recognition Sequence, the Anchor Volume Descriptor Pointers, the Volume Descriptor Sequences, a File Set Descriptor and a Root Directory. Allocation for sparing shall occur during the formatting process. The sparing allocation may be zero in length. The unallocated space descriptors shall be recorded and shall reflect the space allocated to not-spared defective areas and sector sparing areas. The format may include all available space on the medium. However, formatting may be interrupted upon request by the user. Formatting may later be continued to the full space. UDF 2.01 155 March50 April
6.14 Recommendations for Mount Rainier formatted media The following guidelines are established to ensure interchange of Mount Rainier (MRW) formatted media. 6.14.1 Properties of CD-MRW and DVD+MRW media and drives The following is a list of key properties of MRW media and drives: • A Physical Sector Size of 2048 Bytes • The drive performs Read/Modify/Write cycles when needed. Data transfer between the host and the MRW drive is in multiples of 2048 bytes. • Random access read and write is possible • Drive level defect management • The drive performs background physical formatting • The Media Type is Overwritable (partition access type 4) • A Non-Allocatable Space List, Non-Allocatable Space Stream and Sparing table shall not be used on MRW formatted media 6.14.2 Background Physical Formatting At the initialization of the file system, after the Background Physical Formatting has been started, the host must record the first AVDP at sector 256. The second AVDP must be recorded after the Background physical Formatting has been finished. Before the second AVDP has been recorded, the file system is in an intermediate state and is not strictly in compliance with ECMA 167. The disc can be ejected before the background formatting is finished, in that case only one AVDP exists on the MRW disc. Note that at an early eject the drive must format all non-recorded areas up to the highest sector number recorded by the host, this could cause a significant delay in the early eject process. Implementations are recommended to allocate the lowest numbered blocks available while background physical formatting is in progress. The background physical formatting shall not influence the recording of the LVID. At early eject the LVID shall be recorded in the same way as it will be recorded on rewritable media that do not support background physical formatting. UDF 2.01 156 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
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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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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 ==
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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 156 and 157: ISO 9660 converted to UDF 1 st sess
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 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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