- The block that contains pointers to all the groups in a specific file. Each file has two copies of the RIB, one in the first block of the first group, and the second in the block following the last data block in the last group of the file.; 包含有某一文件中各组块的指针的字块。每份文件有二份检索信息字块的复本，一份在第一 组文件的第一个字块内，第二份在最后一组文件中，紧跟在最后一个数据块的字块内。
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