题目详情

文件系统采用多重索引结构搜索文件内容。设块长为512字节,每个块号长3字节,如果不考虑逻辑块号在物理块中所占的位置,那么三级索引时可寻址的文件最大长度为()。

  • A.3.46M
  • B.7.05MB
  • C.599.73MB
  • D.1199.46MB

正确答案及解析

正确答案
D
解析

文件系统采用多重索引结构搜索文件内容。设块长为512字节,每个块号长3字节,那么一个索引块可以存放170个盘块号。如果不考虑逻辑块号在物理块中所占的位置,且文件系统采用二级索引时,那么最多可包含存放文件的盘块号总数N=170×170=28900个盘块,可寻址的文件的最大长度L=28900×256B=7225KB=7.05MB。如果文件系统采用三级索引,那么最多可包含存放文件的盘块号总数N=170×170×170=4913000个盘块;可寻址的文件的最大长度=4913000×256B=1228250KB=1199.46MB。

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