某字长为32位的计算机文件管理系统采用位示图（bitmap）记录磁盘的使用情况。若磁盘的容量为300GB，物理块的大小为1MB，那么位示图的大小为（）个字。
- A.1200
- B.3600
- C.6400
- D.9600
正确答案及解析
正确答案
解析
本题考查操作系统文件管理方面的基础知识。根据题意若磁盘的容量为300GB，物理块的大小为1MB，那么该磁盘有300*1024=307200个物理块，位示图的大小为307200/32=9600个字。
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