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VOLSET.SYS is a system file that resides in the master file directory of a volume. The file contains a list of the labels of all the volumes in the set and the name of the volume set; it is only used on relative volume 1 of a volume set.

ANALYZE/DISK_STRUCTURE uses VOLSET.SYS to locate each volume in the set and confirm the attributes of each volume. Since all volume set information is stored in VOLSET.SYS on relative volume 1, ANALYZE/DISK_STRUCTURE ignores VOLSET.SYS on all other volumes.