Hi,
Please refer to the document below:
Event ID 57608: "A format inconsistency was encountered while positioning to begin a tape read operation on device "%device%"." is reported in the Event Viewer when the VERITAS Backup Exec Job Engine encounters an inconsistency in the data format on the media while positioning to a backup set prior to a restore or verify operation.
http://support.veritas.com/docs/253576
Hope it helps.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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