An address written on a direct access volume, denoting a track's address relative to the beginning of the volume.
记录在直接存取盘卷上的地址，表明相对于盘卷始址的一个磁道地址。
You can store data on secondary storage devices, such as a direct access storage device or magnetic tape volume.
你可以在辅助存储设备上存储数据，例如直接存取存储设备或者磁带。
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