某文件系统采用多级索引结构，若磁盘块的大小为4 KB字章，每个块号需占4字章，那么采用二级索引结构时的文件最大长度可占用（ ）个物理块。
- A.1024
- B.1024×1024
- C.2048×2048
- D.4096×4096
正确答案及解析
正确答案
解析
本题考查索引文件结构，在索引文件结构中，二级间接索引是指索引节点对应的盘块保存索引表，在索引表指向的盘块中依然保存索引表。由于每个索引表可以存4 KB/4=1024个块号，所以二级索引可对应1024×1024个物理块。
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