Eugene:
Hi. This error could be cause by corruption on the Backup to Disk (B2D) files. I will suggest you to run a defrag on the volume where the B2D files are located, also run a check disk.
Final error: 0xe00084f2 - An attempt to write database end of media has failed. Backup Exec returns an error in the backup job log stating "Tape access reached a file mark."
Regards,
Sandra Rodriguez
Advanced Technical Support Engineer