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Managing Media
Verifying Data on a Medium
Chapter 4128
Verifying Data on a Medium
What Is Verifying? Verifying a medium shows whether the data on the medium is valid. It
also updates the information about the medium in the IDB, such as
medium condition.
Data Protector performs the following:
• Checks the Data Protector headers with information about the
medium (medium ID, description, and location.)
• Reads all blocks on the medium.
• If the CRC (Cyclic Redundancy Check) option was used while writing
to the medium, Data Protector recalculates the CRC and compares it
to the one stored on the medium.
If the CRC option was not used, and the verify operation passed, this
means that all the data on the medium has been read. The medium
did not cause a read error, so the hardware status of the tape is at the
very least acceptable. This level of check can be viewed as partial.
Additionally, if the CRC option was used, the backup data itself is
consistent within each block. This level of check has a high level of
reliability.
NOTE Depending on the backup devices and media you use, this task can take a
considerable amount of time to complete.
When to Verify
Media
If errors were reported during backup, you can verify the medium to
check whether the backup is usable.
How to Verify Data
on a Medium
In the Devices & Media context, browse for a medium, right-click it, and
click Verify. For detailed steps, refer to the online Help index keyword
“verifying media”.