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● 当进程请求读磁盘时，操作系统（48）。假设磁盘每磁道有 10 个扇区，移动臂位于 18 号柱面上，且进

程的请求序列如表 1 所示。那么，最省时间的响应序列为（49）。

● 当进程请求读磁盘时，操作系统（48）。假设磁盘每磁道有 10 个扇区，移动臂位于 18 号柱

（48）

A. 只需要进行旋转调度，无须进行移臂调度

B. 旋转、移臂调度同时进行

C. 先进行移臂调度，再进行旋转调度

D. 先进行旋转调度，再进行移臂调度

（49）

A. ②③④⑤⑧①⑦⑥

B. ⑥⑦①⑤⑧②③④

C. ⑤⑧①⑦⑥②④③

D. ⑥⑦⑧①⑤②③④

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