根据文件系统所属的磁盘分区，此流程将对该分区的所有目录返回相同的磁盘使用量统计数据(以字节为单位)。
Based on the disk partition to which the file system belongs, this routine returns the same disk usage statistics in bytes for all directories in that partition.
一种以磁盘或磁带存储器为单位的文件，既可存放作业的输入数据，又可存放结果。
A single file (unit of magnetic disc or magnetic tape storage) that holds the input data for a job and to which the results are written.
固定块结构磁盘中，数据存储和检索的基本单位。
The unit in which data is stored and retrieved on a fixed block architecture disk.
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