U盘启动过程中常见术语的介绍

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  对于新手来说,想要学习U盘启动,就必须要了解其中的一些相关术语,这样在看教程攻略或者听高手传授绝招的时候你才不会糊涂,在U盘启动过程中有哪些常见术语是我们需要了解的呢?下面来和小编一起看看吧。

  BIOS(Basic Input/Output System)基本输入输出系统,全称是ROM-BIOS,是只读存储器基本输入/输出系统的简写,它实际是一组被固化到电脑中,为电脑提供最低级最直接的硬件控制的程序。

  CMOS(Complementary Metal Oxide Semiconductor)本意是指互补金属氧化物半导体,一种大规模应用于集成电路芯片制造的原料,在计算机领域,CMOS常指保存计算机基本启动信息(如日期、时间、启动设置等)的芯片。CMOS 的功耗很低,计算机主板上一个纽扣电池就可以给它长时间地提供电力,即使系统掉电,信息也不会丢失。而当主板电池供电不足时CMOS的信息会丢失,此时启动机器会有一些特殊的现象,如启动时提示 CMOS 参数丢失需重新设置,甚至机器黑屏,不能启动,更换主板上的纽扣电池即恢复正常。有时人们会把CMOS和BIOS混称,其实CMOS是主板上的一块可读写的RAM芯片,是用来保存BIOS的硬件配置和用户对某些参数的设定。而对CMOS中各项参数的设定要通过专门的程序,现在多数厂家将CMOS设置程序做到了BIOS芯片中,在开机时通过按下某个特定键就可进入CMOS设置程序而非常方便地对系统进行设置,因此这种CMOS设置又通常被叫U盘启动中的术语设置。

  ESCD(Extended System Configuration Data)扩展系统配置数据,ESCD是系统BIOS用来与操作系统交换硬件配置信息的一种手段,这些数据被存放在CMOS(一小块特殊的RAM,由主板上的电池来供电)之中,通常ESCD数据只在系统硬件配置发生改变后才会更新。

  扇区(Sector)硬盘划分的最小单位,一个扇区固定为 512 个字节(Byte)。

  MBR(master boot record)即主引导记录,有时也称主引导扇区。位于整个硬盘的 0 扇区(硬盘的 0~62 即前 63 个扇区为保留扇区,目前只有 MBR 占用其中的第一个或前几个扇区),可以看作是硬盘的第一个扇区,通常只占用这一个扇区,如 XP 的 MBR,grub4dos占用 0~17 共 18 个扇区。

  DBR(DOS boot record)即操作系统引导记录区,也称分区的主启动代码,位于分区的第 0 扇区,通常只占用这一个扇区,特殊情况也要占用其它保留扇区,而 grub4dos 如果是写入硬盘 MBR 方式则不修改也不使用 DBR,以 H 结尾或以 0x 开头的数字表示该数字为十六进制数。

  掌握了上面这些常见的U盘启动过程中的术语,是不是对你有了很大帮助?这些U盘术语都是英文缩写过来的,若能把每一个单词的意思都了解清楚,不需要做中文的详细解释了,或许你也能知晓一大半。上面仅是一些常见术语,如果有兴趣的朋友可以发掘更多U盘启动中的其他术语,做一个“术语专家”。

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