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1.2-操作系统
tobeavampire的博客
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操作系统的一个功能是提供抽象的接口，另一个主要功能是管理硬件资源。

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分时系统：每个程序运行一段时间以后都主动让出CPU给其他程序，使得一段时间内每个程序都有机会运行一段时间。

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硬盘的结构介绍：

硬盘的基本存储单位为扇区（Sector）,每个扇区一般为512字节。一个硬盘往往有多个盘片，每个盘片分两面，每面按照同心圆划分为若干个磁道。每个磁道划分为若干个扇区

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