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Layout of Type 2 partition map for sparable partition RBP Length Name Contents 0 1 Partition Map Type Uint8 = 2 1 1 Partition Map Length Uint8 = 64 2 2 Reserved #00 bytes 4 32 Partition Type Identifier EntityID 36 2 Volume Sequence Number Uint16 38 2 Partition Number Uint16 40 2 Packet Length Uint16 42 1 Number of Sparing Tables (=N_ST) Uint8 43 1 Reserved #00 byte 44 4 Size of each sparing table Uint32 48 4 * N_ST Locations of sparing tables Uint32 48 + 4 * N_ST 16 - 4 * N_ST Pad #00 bytes • Partition Type Identifier: • Flags = 0 • Identifier = *UDF Sparable Partition • IdentifierSuffix is recorded as defined in section 2.1.5. • Partition Number = the number of this partition. Shall identify a Partition Descriptor associated with this partition. • Packet Length = the number of user data blocks per fixed packet. This value is specified in the medium specific section of Appendix 6. • Number of Sparing Tables = the number of redundant tables recorded. This shall be a value in the range of 1 to 4. • Size of each sparing table = Length, in bytes, allocated for each sparing table. • Locations of sparing tables = the start locations of each sparing table specified as a media block address. Implementations should align the start of each sparing table with the beginning of a packet. Implementations should record at least two sparing tables in physically distant locations. 2.2.10 Metadata Partition Map This partition map shall be recorded for volumes which contain a single partition having an access type of 1 (read only) or 4 (overwritable). It shall not be recorded in all other cases. See section 2.2.13 for further description of the metadata partition. UDF 2.01 33 March50 April
Layout of Type 2 partition map for metadata partition RBP Length Name Contents 0 1 Partition Map Type Uint8 = 2 1 1 Partition Map Length Uint8 = 64 2 2 Reserved #00 bytes 4 32 Partition Type Identifier EntityID 36 2 Volume Sequence Number Uint16 38 2 Partition Number Uint16 40 4 Metadata File Location Uint32 44 4 Metadata Mirror File Location Uint32 48 4 Metadata Bitmap File Location Uint32 52 4 Allocation Unit Size (blocks) Uint32 56 2 Alignment Unit Size (blocks) Uint16 58 1 Flags Uint8 59 5 Reserved #00 bytes • Partition Type Identifier: • Flags = 0 • Identifier = *UDF Metadata Partition • IdentifierSuffix is recorded as in section 2.1.5. • Partition Number = the number of this partition. Shall identify a Partition Descriptor associated with this partition. This shall match the partition number in the Type 1 map or Type 2 sparable map, one and only one of which shall also be recorded as appropriate to the media type. • Metadata File Location = address of the block containing the File Entry for the metadata file. This address shall be interpreted as a logical block number within the physical or sparable partition associated with this partition map (see above “Partition Number” field). • Metadata Mirror File Location = address of block containing the File Entry for the metadata file mirror. This address shall be interpreted as a logical block number within the physical or sparable partition associated with this partition map (see above “Partition Number” field). • Metadata Bitmap File Location = the address of of block containing the File Entry for the metadata bitmap file. This address shall be interpreted as a logical block number within the physical or sparable partition associated with this partition map (see above “Partition Number” field). • Allocation Unit Size = the number of logical blocks per Allocation Unit for the metadata file (and mirror file) associated with this partition map. This value shall be an integer multiple of the larger of the following three values: (media ECC block size (divided by) logical block size); Packet Length (if a type 2 sparable partition map is recorded); 32. • Alignment Unit Size (blocks) = all extents allocated to the Metadata File (or Mirror File) must have a starting Lbn which is an integer multiple of this value. This value shall be an integer multiple of the larger of the following: (media ECC block size (divided by) logical block size); Packet Length (if a type 2 sparable partition map is recorded). • Flags: • Bit 0 – “Duplicate Metadata Flag”: When set, indicates that the Metadata Mirror file has its own unique allocation (i.e. it duplicates the data in the Metadata File). When clear indicates that the Metadata Mirror File allocation descriptors describe the same allocation as the Metadata File allocation descriptors (i.e. the data is not duplicated, and the data blocks are shared between both main and mirror files, but each File Entry and its associated allocation descriptors are unique and distinct). UDF 2.01 34 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 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
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
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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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