Volume Descriptor Set Terminator
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8.3
Volume Descriptor Set Terminator
The recorded set of Volume Descriptors shall be terminated by a sequence of one or more Volume Descriptor
Set Terminators.
BP Field
name
Content
1
Volume Descriptor Type
numerical value
2 to 6
Standard Identifier
CD001
7
Volume Descriptor Version
numerical value
8 to 2048
(Reserved for future standardization)
(00) bytes
8.3.1
Volume Descriptor Type (BP 1)
This field shall specify an 8-bit number indicating that the Volume Descriptor is a Volume Descriptor Set
Terminator.
The number in this field shall be 255.
This field shall be recorded according to 7.1.1.
8.3.2
Standard Identifier (BP 2 to 6)
This field shall specify an identification of this Standard.
The characters in this field shall be CD001.
8.3.3
Volume Descriptor Version (BP 7)
This field shall specify as an 8-bit number the version of the specification of the Volume Descriptor Set
Terminator.
1 shall indicate the structure of this Standard.
This field shall be recorded according to 7.1.1.
8.3.4
Reserved for future standardization (BP 8 to 2048)
All bytes of this field shall be set to (00).
8.4
Primary Volume Descriptor
The Primary Volume Descriptor shall identify the volume, a system which can recognize and act upon the content
of the Logical Sectors with Logical Sector Numbers 0 to 15, the size of the Volume Space, the version of the
standard which applies to the Volume Descriptor, the version of the specification which applies to the Directory
Records and the Path Table Records and certain attributes of the volume.
BP Field
name
Content
1
Volume Descriptor Type
numerical value
2 to 6
Standard Identifier
CD001
7
Volume Descriptor Version
numerical value
8
Unused Field
(00) byte
9 to 40
System Identifier
a-characters
41 to 72
Volume Identifier
d-characters
73 to 80
Unused Field
(00) bytes
81 to 88
Volume Space Size
numerical value
89 to 120
Unused Field
(00) bytes
121 to 124
Volume Set Size
numerical value
125 to 128
Volume Sequence Number
numerical value
129 to 132
Logical Block Size
numerical value
