Given an indication of a backup DASD, the volume table of contents (VTOC) for the volume drives the audit. AUDIT handles each Format 1 DSCB in the VTOC as follows:
If the DSCB indicates a utility data set, AUDIT does not check it further. If FIX is specified, AUDIT scratches and uncatalogs the data set, overriding any expiration date, and issuing a message to identify the data set. (The utility data set names detected on primary and migration volumes should not occur on a backup volume.)
For each remaining DSCB, AUDIT tries to read a corresponding backup version record from the BCDS. If such a record exists, but the volume indicated in that record is not the same as the volume being audited, AUDIT reports *ERR 14.