The volume descriptor set includes an arbitrary number of secondary volume descriptors. The secondary volume descriptor describes volume attributes, the location of the root directory, the location of the path table group, and so on.
記録 Record in the secondary volume descriptor when using Japanese for identifiers such as volume names and publisher identifiers. The details of the secondary volume descriptor are shown in Table 3.5.

Table 3.3 Secondary volume descriptor structure

byte position	type	Field name	Description
1 2 ~ 6 7 8 9 ~ 40 41 ~ 72 73 ~ 80 81 ~ 88 89-120 121-124 125-128 129-132 133-140 141-144 145-148 149-152 153-156 157-190 191-318 319-446 447-574 575-702 703 ~ 739 740 ~ 776 777 ~ 813 814 ~ 830 831 ~ 847 848 ~ 864 865 ~ 881 882 883 884 ~ 1395 1396 ~ 2048	N N A1 D1 00 NB 00 NB NB NB NB NL NL NM NM DE D1 A1 A1 A1 D1S D1S D1S ND ND ND ND N 00	Volume Descriptor Type Standard Identifier Volume Descriptor Version Volume Flag System Identifier Volume Identifier Unused Field Volume SpaceSize Unused Field Volume Set Size Volume Sequence Number Logical Block Size Path Table Size Location of Occurence of Type L Path Table Location of Optional Occurence of Type L Path Table Location of Occurence of Type M Path Table Location of Optional Occurence of Type M Path Table Directory Record for Root Directory VolumeSet Identifier Publisher Identifier Data Preparer Identifier Application Identifier Copyright File Identifier Abstract File Identifier Bibliographic File Identifier Volume Creation Date and Time Volume Modification Dateand Time Volume Expiration Date and Time Volume Effective Date and Time File Structure Version Reserved for future standardization Application Use Reserved for future standardization	Volume descriptor type Standard identifier 'CD001' Volume descriptor version Volume flag System using LSN 0-15 Volume name Unused Number of sectors in entire volume Unused Number of volumes in multi-volume = 1 Volume serial number in multi-volume Logical block length path Number of bytes in the entire table Path table position in LSBF Spare Path table position in MSBF Spare Root directory Directory record of multi-volume overall name publisher identifier data editor identifier identification of data usage copyright file name abstract (summary) file name Bibliographic file name Date created, time Update date, Time Expired date, Time Effective date, Time File structure version Reserved for future standardization Not specified Reserved for future standardization