当磁盘被初始化后，存储空间的分块大小就确定了，但由于不同的用户或同一用户的不同文件的逻辑记录大小是各不相同的。在逻辑记录较小的情况下，若让一个逻辑记录独占一个物理块，那么存储空间的利用率是不高的。操作系统提供逻辑记录的成组和分解操作不仅有利于提高存储空间的利用率，而且可减少输入输出操作次数，提高计算机系统的工作效率。本实习帮助我们掌握成组和分解操作的技术以及了解成组和分解操作的实现过程。-When the disk is initialized, the block size of the storage space to determine, but because of different users or different users of the same file logical record size is different. In the case of a small logical record, if a logical record exclusive to a physical block, then the storage space utilization is not high. Operating system provides logical grouping and decomposition of the record operation is not only conducive to improving the utilization of storage space, but also can reduce the number of input and output operations, improve the efficiency of computer systems. This internship helps us master the techniques of grouping and decomposition operations as well as understanding the implementation of grouping and decomposition operations.