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数据恢复常识

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  • Update : 2009-05-04
  • Size : 85.27kb
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  • Author :mysolarstar
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Introduction - If you have any usage issues, please Google them yourself
硬盘存储数据是根据电、磁转换原理实现的。硬盘由一个或几个表面镀有磁性物质的金属或玻璃等物质盘 片以及盘片两面所安装的磁头和相应的控制电路组成(图1),其中盘片和磁头密封在无尘的金属壳中。 硬盘工作时,盘片以设计转速高速旋转,设置在盘片表面的磁头则在电路控制下径向移动到指定位置然后 将数据存储或读取出来。当系统向硬盘写入数据时,磁头中“写数据”电流产生磁场使盘片表面磁性物质 状态发生改变,并在写电流磁场消失后仍能保持,这样数据就存储下来了;当系统从硬盘中读数据时,磁 头经过盘片指定区域,盘片表面磁场使磁头产生感应电流或线圈阻抗产生变化,经相关电路处理后还原成 数据。因此只要能将盘片表面处理得更平滑、磁头设计得更精密以及尽量提高盘片旋转速度,就能造出容 量更大、读写数据速度更快的硬盘。这是因为盘片表面处理越平、转速越快就能越使磁头离盘片表面越近 ,提高读、写灵敏度和速度;磁头设计越小越精密就能使磁头在盘片上占用空间越小,使磁头在一张盘片 上建立更多的磁道以存储更多的数据。
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Packet : 硬盘知识.txt filelist
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