An identification number, normally recorded on a tape headerlabel, which is allocated to a new magnetic tape and remains the same through the life of the tape although all other identifying information may change.

• 一种记录在磁带头标上的标识号，它被分配给新的磁带，并且在磁带的使用期内保持不变，虽然其它的标识信息有可能改变。