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1.3.3 Terms May Optional Shall Should Reserved Indicates an action or feature that is optional. Describes a feature that may or may not be implemented. If implemented, the feature shall be implemented as described. Indicates an action or feature that is mandatory and must be implemented to claim compliance to this standard. Indicates an action or feature that is optional, but its implementation is strongly recommended. A reserved field is reserved for future use and shall be set to zero. A reserved value is reserved for future use and shall not be used. 1.3.4 Acronyms Acronym AD AVDP EA EFE FE FID FSD ICB IUVD LV LVD LVID PD PVD SBD USD VAT VDS VRS Definition Allocation Descriptor Anchor Volume Descriptor Pointer Extended Attribute Extended File Entry File Entry File Identifier Descriptor File Set Descriptor Information Control Block Implementation Use Volume Descriptor Logical Volume Logical Volume Descriptor Logical Volume Integrity Descriptor Partition Descriptor Primary Volume Descriptor Space Bitmap Descriptor Unallocated Space Descriptor Virtual Allocation Table Volume Descriptor Sequence Volume Recognition Sequence UDF 2.01 7 March50 April
2. Basic Restrictions & Requirements The following table summarizes several of the basic restrictions and requirements defined in this specification. These restrictions & requirements as well as additional ones are described in detail in the following sections of this specification. Item Logical Sector Size Logical Block Size Volume Sets First 32K of Volume Space Volume Recognition Sequence Timestamp Entity Identifiers Descriptor CRCs File Name Length Extent Length Primary Volume Descriptor Anchor Volume Descriptor Pointer Partition Descriptor Restrictions & Requirements The Logical Sector Size for a specific volume shall be the same as the physical sector size of the specific volume. The Logical Block Size for a Logical Volume shall be set to the logical sector size of the volume or volume set on which the specific logical volume resides. All media within the same Volume Set shall have the same physical sector size. Rewritable/Overwritable media and WORM media shall not be mixed in/ be present in the same volume set. The first 32768 bytes of the Volume space shall not be used for the recording of ECMA 167 structures. This area shall not be referenced by the Unallocated Space Descriptor or any other ECMA 167 descriptor. This is intended for use by the native operating system. The Volume Recognition Sequence as described in part 2 of ECMA 167 shall be recorded. All timestamps shall be recorded in local time. Time zones shall be recorded on operating systems that support the concept of a time zone. Entity Identifiers shall be recorded in accordance with this document. Unless otherwise specified in this specification the Entity Identifiers shall contain a value that uniquely identifies the implementation. CRCs shall be supported and calculated for all Descriptors, except for the Space Bitmap Descriptor. There is a CRC length special case for the Allocation Extent Descriptor. Maximum of 255 bytes Maximum Extent Length shall be 2 30 – 1 rounded down to the nearest integral multiple of the Logical Block Size. Maximum Extent Length for extents in virtual space shall be the Logical Block Size. There shall be exactly one prevailing Primary Volume Descriptor recorded per volume. The media where the VolumeSequenceNumber of this descriptor is equal to 1 (one) must be part of the logical volume defined by the prevailing Logical Volume Descriptor. Shall be recorded in at least 2 of the following 3 locations: 256, N-256, or N, where N is the last addressable sector of a volume. See also 2.2.3. A Partition Descriptor Access Type of Read-Only, Rewritable, Overwritable and WORMWrite-Once shall be supported. There shall be exactly one prevailing Partition Descriptor recorded per volume, with one exception. For Volume Sets that consist of single volume, the volume may contain 2 UDF 2.01 8 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 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 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
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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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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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