磁盘调度算法也是操作系统中比较重要的一环，磁盘调度的好坏直接影响到运行速度的快慢-Operating system disk scheduling algorithm is also the more important part, disk scheduling a direct impact on the pace of running

电磁三轮闭环程序速度2.2m左右可圆环，可借鉴写法(Electromagnetic three wheel, closed loop programThe speed of 2.2m is around the circle, and can be used for reference)