硬盘是计算机最重要的外设之一，它主要用于信息的存储和读取。由于硬盘的速度相对于ＣＰＵ、内存、显卡等的速度来说要慢得多，因此可以说硬盘的性能在一定程度上决定了计算机的最终性能。 与其他磁记录设备相同，硬盘也是通过磁头对磁记录介质的读写来存取信息的。而与其他磁 Hard disk is one of the most important peripherals of a computer, it is mainly used for storing and reading information. Since the speed of a hard disk is much slower than that of a CPU, memory, video card, etc., it can be said that the performance of the hard disk determines to a certain extent the final performance of the computer. As with other magnetic recording devices, the hard disk also accesses information by reading and writing the magnetic recording medium by the magnetic head. And with other magnetic