disk

代码说明：

   磁盘是高速、大容量、旋转型、可直接存取的存储设备。它作为计算机系统的辅助存储器，担负着繁重的输入输出工作，在现代计算机系统中往往同时会有若干个要求访问磁盘的输入输出要求。系统可采用一种策略，尽可能按最佳次序执行访问磁盘的请求。由于磁盘访问时间主要受寻道时间T的影响，为此需要采用合适的寻道算法，以降低寻道时间。本实验要求学生模拟设计一个磁盘调度程序，观察调度程序的动态运行过程。通过实验让学生理解和掌握磁盘调度的职能。(Disk is the high-speed, large capacity, rotating, direct access storage device. As a secondary computer system memory, to carry out heavy work input and output in modern computer systems often also have a number of requests to access the disk input and output requirements. System can use a strategy, as far as possible the best order of implementation of the disk access requests. As the disk access time is mainly affected by the impact of seek time T, which requires use of appropriate seeking algorithms to reduce the seek time. This experiment requires students to design a disk scheduling simulation program, observe the dynamic process scheduler. Experiments for students to understand and grasp the disk scheduling functions.)