The volume descriptor set includes one basic volume descriptor. The basic volume descriptor describes volume attributes, the location of the root directory, the location of the path table group, and so on.
Details of basic volume descriptor are shown in Table 3.3.

Table 3.3 Basic 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 00 A D 00 NB 00 NB NB NB NB NL NL NM NM DE D A A A DS DS DS ND ND ND ND N 00	Volume Descriptor Type Standard Identifier Volume Descriptor Version Unused Field 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 = 01 Standard identifier 'CD001' Volume descriptor version Not used System using LSN 0-15 Volume name Unused Number of sectors in the entire volume Unused Number of volumes in multi-volume = 1 Volume serial number in multi-volume Logical block length Number of bytes in the entire path table Path table position in LSBF Spare Path table position in MSBF Spare Root directory directory record Multiple volume name Publisher identifier Data editor identifier Identification of data usage Copyright file name Abstract (summary) File name Bibliographic file name Creation date, time Update date, Time Expiration date, Time Effective date, Time File structure version To ensure for ensuring CD-ROM XA standard compliant of future standardization for standardization of come

The CD-ROM XA standard defines the following areas as disc labels.

Table 3.4 Disc labels on CD-ROM XA

byte position	type	Field name	Description
1025-1032 1033-1034 1035-1042 1043-1050	D 00	Identifying Signature CD-ROM XA Flags Startup Directory Reserved	'CD-XA001' Reserved area Starting directory name Reserved area