The collection of tracks on the various platters that can be read without moving the head is called a cylinder.
各盘片上在无需移动磁头的前提下即可读取的磁道的集合称为柱面。
2
Circular cylinder is a basic move along a straight line trajectory can be considered as a collection of the same diameter of the circle, if the horizontal section of film, then it is a straight line.
圆筒是基本的圆沿着直线移动的轨迹，可以考虑为相同直径的圆的集合，如果水平放置节片的话它就是直线。
3
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