Veeam Support Knowledge Base
An attempt to access data before the beginning-of-medium marker failed

An attempt to access data before the beginning-of-medium marker failed

KB ID:	2003
Product:	Veeam Backup & Replication \| 8.0 \| 9.0 \| 9.5 \| 10 \| 11 \| 12 \| 12.1 \| 12.2
Published:	2015-02-05
Last Modified:	2021-05-12

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Challenge

During a tape related process in Veeam Backup & Replication the error “An attempt to access data before the beginning-of-medium marker failed” is thrown.

Cause

The most common cause of this is faulty tape.

Solution

If there is no content on the tape try erasing it, if the issue persists try a different tape. If the task is successful with a different tape, the tape that caused this error is most likely faulty.

For Veeam Backup & Replication builds [11.0.0.837] through [11.0.0.837 P20210401]

Tape positioning error: The end-of-data marker was reached during an operation

The error message shown above in this note, which appears similar to the error on this article but is different, may occur due to a known bug in Veeam Backup & Replication v11 builds:

11.0.0.837
11.0.0.837 P20210319
11.0.0.837 P20210324
11.0.0.837 P20210401

This issue is resolved in 11.0.0.837 P20210507 and later builds. Please update:
https://www.veeam.com/kb2680

If the issue persists after updating, please create a Support Case.

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