What is the difference between FROZEN What is the difference between FROZEN and SUSPENDED volumes (tapes) in NetBackupand SUSPENDED volumes (tapes) in NetBackup

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A FROZEN volume is unavailable for future backups. A FROZEN volume never expires, even after the retention period ends for all backups on the media. The media ID is never deleted from the NetBackup media catalog, and it remains assigned to NetBackup.

Whereas SUSPENDED volumes cannot be used for backups until retention periods for all backups on the media have expired. At that time, NetBackup deletes the SUSPENDED volume from the NetBackup media catalog and unassigns it from NetBackup.
Note : Both SUSPENDED and FROZEN volumes (tapes) are available for restores.