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• An intermediate state is allowed on CD-R media in which only one AVDP is recorded; this single AVDP shall be at sector 256 or sector 512 and according to the multi-session rules below. • Sequential file system writing shall be performed with variable packet writing. This allows maximum space efficiency for large and small updates. Variable packet writing is more compatible with CD-ROM drives, as current models do not support method 2 addressing required by fixed packets. • The Logical Volume Integrity descriptor shall be recorded and the volume marked as open. Logical volume integrity can be verified by finding the VAT ICB at the last recorded Physical Address. If the VAT ICB is present, the volume is clean; otherwise it is dirty. • The Partition Header descriptor, if recorded, shall specify no Unallocated Space Table, no Unallocated Space Bitmap, no Partition Integrity Table, no Freed Space Table, and no Freed Space Bitmap. The drive is capable of reporting free space directly, eliminating the need for a separate descriptor. • Each surface shall contain 0 or 1 read only partitions, 0 or 1 write once partitions, and 0 or 1 virtual partitions. CD-R media should contain 1 write once partition and 1 virtual partition. 6.10.1.2 UDF “Bridge” formats ISO 9660 requires a Primary Volume Descriptor (PVD) at sector 16. If an ISO 9660 file system is desired, it may contain references to the same files as those referenced by ECMA 167 structures, or reference a different set of files, or a combination of the two. It is assumed that early implementations will record some ISO 9660 structures but that as implementations of UDF become available, the need for ISO 9660 structures will decrease. If an ISO 9660 bridge disc contains Mode 2 Form 1 sectors, then the CD-ROM XA extensions for ISO 9660 must be used. 6.10.1.3 End of session data A session is closed to enable reading by CD-ROM drives. The last complete session on the disc shall conform completely to ECMA 167 and have two AVDPs recorded. This shall be accomplished by writing data according to End of session data table below. Although not shown in the following example, the data may be written in multiple packets. UDF 2.01 141 March50 April
End of session data Count Description 1 Anchor Volume Descriptor Pointer 255 Implementation specific. May contain user data, file system structures, and/or link areas. 1 VAT ICB. The implementation specific data may contain repeated copies of the VAT and VAT ICB. Compatibility with drives that do not accurately report the location of the last sector will be enhanced. Implementations shall ensure that enough space is available to record the end of session data. Recording the end of session data brings a volume into compliance with ECMA 167. 6.10.2 Use of UDF on CD-RW media CD-RW media is randomly readable and block writable. This means that while any individual sector may be read, writing must occur in blocks containing multiple sectors. CD-RW systems do not provide for sparing of bad areas. Writing rules and sparing mechanisms have been defined. 6.10.2.1 Requirements • Writing which conforms to this section of the standard shall be performed using fixed length packets. • Writing shall be performed using Mode 1 or Mode 2, Form 1 sectors. On one disc, either Mode 1 or Mode 2 Form 1 shall be used. NOTE: According to the Multisession CD Specification, all data sessions on a disc must be of the same type (Mode 1, or Mode 2 Form 1). • If Mode 2 Form 1 is used, then the subheader bytes of all sectors used by the user data files and by the UDF structures shall have the following value: File number = 0 Channel number = 0 Submode = 08h Coding information = 0 UDF 2.01 142 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
Page 100 and 101: Object Logical Block Number is the
Page 102 and 103: mechanism for the host software to
Page 104 and 105: 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 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 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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