The Common VTOC Access Facility (CVAF) detected a VTOC index error on the device dev with volume serial number volser. A number that represents the kind of VTOC index error is provided in the code field. The RBA of the VIR in the VTOC index that contains the structure error indicated by code is provided in the rba field. If the VIR is a VIER, the section number in the VIER containing the VTOC index entry is supplied in the secno field, and the offset into the section of that VTOC index entry is supplied in the offset field.