Hi,
Hardware compression is done by the device. Backup Exec only gives signals to the device so that compression can be done.
Please refer to the following technote:
- Backups fail to get double the amount of the native capacity recorded to a media, even when hardware compression is being utilized.
http://seer.support.veritas.com/docs/199542.htm
Also try performing a long erase on the media and verify the results.
We hope this will help.
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Thanks.