Hello,
Since when do you get these errors? Are you performing any specific media operations when the errors occur like inventory,eject ? Refer to the following technote in order to resolve the problem:
Title: "Data error (cyclic redundancy check)" is reported in the Backup Exec job log during a failed backup/verify operation
http://support.veritas.com/docs/192216
Hope this helps. If the issues persists, as mentioned, check with the hardware manufacturer.
Note : If we do not receive your reply within two business days, this post would be marked ‘assumed answered’ and would be moved to ‘answered questions’ pool.
Regards.