随着信息爆炸时代的到来，对增加磁盘存储密度的要求与日俱增。为了获得更高的存储密度，在增加ｂｉｔ密度的同时还需要保持高的信噪比。传统的作法是减小存储介质颗粒的尺寸，使每ｂｉｔ信息占有的颗粒数目达到几百个，然而根据磁存储介质制造厂商们的预计，这种方法将会受到 With the advent of the information explosion era, the demand for increasing the storage density of disks has been increasing day by day. In order to obtain a higher storage density, it is also necessary to maintain a high signal-to-noise ratio while increasing the bit density. Traditionally, the size of storage media particles has been reduced to hundreds of particles per bit of information, but according to the expectations of manufacturers of magnetic storage media this method will suffer