某操作系统文件管理采用索引节点法。每个文件的索引节点有8个地址项，每个地址项大小为4字节，其中5个地址项为直接地址索引，2个地址项是一级间接地址索引，1个地址项是二级间接地址索引，磁盘索引块和磁盘数据块大小均为1KB。若要访问文件的逻辑块号分别为1和518，则系统应分别采用（ ）。
- A.直接地址索引和一级间接地址索引
- B.直接地址索引和二级间接地址索引
- C.一级间接地址索引和一级间接地址索引
- D.一级间接地址索引和二级间接地址索引
正确答案及解析
正确答案
解析
每个物理块大小为1KB，每个地址项大小为4B，因此每个物理块可以对应地址项个数为：1KB/4B=256。
直接索引即索引直接指向物理块，可以表示逻辑块号范围：0~4号
一级索引即索引节点指向的物理块用来存放地址项，可以表示256个地址项，即256个物理块，可以表示逻辑地址块号范围：5~260，261~516号
二级索引即索引节点指向的物理块，存放的是一级索引的地址块地址，一共有256个地址块用来存放一级索引，每个块可以存放256个地址项，共有2562=65536个地址项，因此可以表示的逻辑块号范围：517~66052号
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