数据库系统实现课后答案,杨冬青译,第二版
(1)磁盘容量
共10个盘面，每个盘面100 000个磁道，所以共10*100 000个磁道
每个磁道1000个扇区，每个扇区1024个字节，所以磁盘的容量为
10*100 000*1000*1024B=9
10KB
（2）平均位密度
每个磁道1000个扇区，每个扇区1024个字节，每个字节8bit故每个磁道容量为1000KB，对于3.5英寸直径上的位密度可计算为
1000*1024*8/(3.5*π%
?)=828227.68173bit/inch
90
（3）最大寻道时间
最大寻道时间出现在从最内层磁道寻找最外层磁道，或者相反，此时磁头经过99999个磁道，故最大寻道时间计算为
（1+0.0002*99999）ms=20.9998 ms
(4) 最大旋转等待时间
最大旋转等待时间为旋转一圈所用的时间，即60/10000s=6ms
(5) 块传输时间65536字节（64扇区）
要传输64扇区的块，磁头必须经过64个扇区和63个空隙，空隙占20%，扇区占80%，围绕着圆周有1000个扇区，1000个空隙，由于间隙合在一起为72度，扇区为288度，所以64个扇区63个空隙的总度数为(72*63/1000)+(288*64/1000)=22.968度，传输时间为
22.968/360*6ms=0.3828ms
(6) 平均寻道时间
在磁盘上移动1/3的距离需要1+0.0002n=1+0.0002*(100 000/3)=7.667ms (7) 平均旋转等待时间
平均旋转等待时间为旋转半周所花费的时间，即3ms
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