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最近,有不少的朋友都想加个硬盘,包括我自己,如何挑一个硬盘呢?以我的愚见,选购硬盘,主要看硬盘的速度。一、硬盘的速度影响硬盘速度的因素有很多,不过主要看的有以下两点:1.硬盘的单碟片容量。现在硬盘的技术越来越先进,多数的硬盘都采用MR（Magneto-ResistiveHead）磁阻磁头技术和PRML（PartialResponseMaximumLikeli-hood,局部响应最大相似性读磁道技术）读取技术。磁阻磁头是基于磁滞电阻效应工作的,核心是一片金属材料,其电阻随磁场的变化而变化。磁阻元件连着一个十分敏感的放大器,可以测出微小的电阻变化。所以先进的MR技术可以提高记录密度来记录数据,增加单碟片容量即硬盘的最高容量。IBM最新的Deskstar16GP和14GXP硬盘采用了GMR磁头（GiantMagneto-Resistiveheads）,这种磁头能比MR和MRX扩充式磁阻磁头更有效地提高盘面的存储密度。PRML读取技术,它能使盘片存储更多的信息,即增加容量,同时可以有效地提高数据的读取和数据传输率。这种技术能在硬盘信号读取时避免因磁道过窄造成的信号干扰,因而可以大幅度地提高盘片的密度。单碟片的容量提高,即提高盘面的存储密度,一方面降低了成本,另一方面利于数据传输率的提高,使得在单位时间内和硬盘的转速不变的情况下磁头的寻道动作和移动距离减少,
Recently, many friends want to add a hard disk, including myself, how to pick a hard disk? In my humble opinion, buy a hard disk, mainly to see the hard drive speed. First, the speed of the hard disk There are many factors that affect the speed of the hard disk, but mainly to see the following two points: 1. Hard disk single disc capacity. Now the hard disk technology is more and more advanced, most of the hard disk using MR (Magneto-ResistiveHead) magnetoresistive head technology and PRML (PartialResponseMaximumLikeli-hood, partial response maximum similarity read track technology) reading technology. Magnetoresistive head is based on hysteresis resistance effect of work, the core is a metal material, the resistance changes with the magnetic field changes. Magnetoresistive element attached to a very sensitive amplifier, you can measure small resistance changes. Therefore, advanced MR technology can improve the recording density to record data, increase the capacity of a single disc that is the maximum capacity of the hard disk. IBM’s newest Deskstar16GP and 14GXP drives feature GMR Magnetto-Resistiveheads, which increase the storage density of the disk more effectively than MR and MRX Expanded Magnetoresistive heads. PRML reading technology, which enables the disc to store more information, that is, increase the capacity, and can effectively improve data read and data transfer rates. This kind of technology can avoid the signal interference caused by too narrow track when the hard disk signal is read, so can greatly improve the density of the disk. Increasing the capacity of a single disc, that is, to improve the storage density of the disk surface, on the one hand to reduce costs, on the other hand conducive to the data transfer rate increase, making the unit time and the hard disk speed unchanged head seek action and Moving distance decreases,