Every volume of backup media (disk file or tape) contains a media header that is created when by the first backup operation that uses the tape (or disk).

• 备份媒体(磁盘文件或磁带)的每个卷都包含媒体标头,媒体标头是在第一次使用磁带(或磁盘)执行备份操作时创建的。