一种磁盘存储设备，其中一些磁盘是固定的，另一些则可以由操作员更换其中的盘片。
A magnetic disk unit in which some disks are fixed and others may be exchanged by an operator.
一种按固定长度数据块来存储数据的磁盘存储设备，这些数据块按相对于某文件开始的块号进行寻址。
A disk storage device that stores data in blocks of fixed size; these blocks are addressed by block number relative to the beginning of the particular file.
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