假设某磁盘的每个磁道划分成9个物理块，每块存放1个逻辑记录。逻辑记录R0，R1，…，R8存放在同一个磁道上，记录的安排顺序如下表所示：
如果磁盘的旋转速度为27ms/周，磁头当前处在R0的开始处。若系统顺序处理这些记录，使用单缓冲区，每个记录处理时间为3ms，则处理这9个记录的最长时间为（ ）；若对信息存储进行优化分布后，处理9个记录的最少时间为（ ）。
问题1选项
A.54ms
B.108ms
C.246ms
D.243ms
问题2选项
A.27ms
B.54ms
C.108ms
D.216ms
正确答案及解析
正确答案
解析
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