CD-ROM和磁盘之间的区别

1. CD-ROM：
CD-ROM是嵌入塑料保护壳中的金属光盘。每张光盘都必须被母版制作，这是创建CD并将数据放置在CD上的过程。 CD是WORM(一次写入，多次读取)介质，这是指光盘一旦被掌握，就无法更改其上的数据。

2.磁盘：
磁盘包含金属或塑料制成的圆形磁盘。磁盘的两面通常用于存储数据。磁盘被磁性氧化物覆盖。磁盘分为多个同心圆，称为磁道，磁道又分为存储数据的扇区。

这是CD-ROM和磁盘之间的区别：

CD-ROM	Magnetic Disks
It is metal disc embedded into plastic.	It contains metal or plastic.
Sectors in CD-ROM are organized along a spiral.	Sectors in Magnetic disks are organized in concentric track.
It has CLV (Constant Linear Velocity).	It has CAV (Constant Angular Velocity).
Sectors in CD-ROM have same linear length.	Sectors in Magnetic disks have same angular length.
In CD-ROM, data is packed at its maximum density permitted.	In Magnetic disks, data is written less densely in the outer tracks.
It takes advantage of all storage space.	It doesn’t use up all storage available.
It has to change rotational speed when seeking.	It operates on constant speed, timing marks to delimit tracks.