Backups failing in Backup Exec 11d because of low disk space.

We are running backups using Symantec Backup Exec 11d.  We have a 4TB iSCSI SAN drive.  The backup media wizard is set to keep backups for two weeks.  We currently have enough space to hold about a months worth of backups.  The backup job has "Append to media, overwrite if no appendable media is available" selected.  However, instead of overwriting old backups, backups seem to run until the drive is completely full and then stop mid-backup with the error "Low disk space."  Why does this happen?  Is there a way to fix this so that backups will overwrite old media correctly?

Thank you
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Iamthecreator OMCommented:
On the B2D properties, Please ensure that you do not have any RESERVED DISK SPACE set
also if you are running GRT based backup you might have to manually reclaim disk space

Granular Restore Technology (GRT) used with a Backup-to-Disk (B2D) device  results in the disk or the reserved disk space being filled up with  overwriteable image (IMG) folders before the oldest IMG media will be  overwritten.
http://support.veritas.com/docs/286794 



About reclaiming disk space for GRT-enabled backup operations
http://support.veritas.com/docs/299347 
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