Volume Effective Date and Time
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8.4.29
Volume Effective Date and Time (BP 865 to 881)
This field shall specify the date and the time of the day at which the information in the volume may be used. If
the date and time are not specified then the information may be used at once.
This field shall be recorded according to 8.4.26.1.
8.4.30
File Structure Version (BP 882)
This field shall specify as an 8-bit number the version of the specification of the records of a directory and of a
Path Table.
1 shall indicate the structure of this Standard.
This field shall be recorded according to 7.1.1.
8.4.31
Reserved for future standardization (BP 883)
This field shall be set to (00).
8.4.32
Application Use (BP 884 to 1395)
This field shall be reserved for application use. Its content is not specified by this Standard.
8.4.33
Reserved for future standardization (BP 1396 to 2048)
All bytes of this field shall be set to (00).
8.5
Supplementary Volume Descriptor
The Supplementary 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, certain attributes of the volume and the coded graphic character sets used to
interpret descriptor fields that contain characters.
Within a Volume Descriptor Set the contents of the fields of this descriptor shall be identical with the contents of
the corresponding fields in a Primary Volume Descriptor except for the following fields.
BP Field
name
Content
1
Volume Descriptor Type
numerical value
2 to 6
Standard Identifier
CD001
7
Volume Descriptor Version
numerical value
8
Volume Flags
8 bits
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
Escape Sequences
32 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
133 to 140
Path Table Size
numerical value
141 to 144
Location of Occurrence of Type L Path Table
numerical value
145 to 148
Location of Optional Occurrence of Type L Path Table numerical value
149 to 152
Location of Occurrence of Type M Path Table
numerical value
153 to 156
Location of Optional Occurrence of Type M Path
Table
numerical value
157 to 190
Directory Record for Root Directory
34 bytes
191 to 318
Volume Set Identifier
d-characters
319 to 446
Publisher Identifier
a-characters
