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  3. 學習啦>學習電腦>選購與維護>臺式機>《只讀存儲器有什么特點》正文

    只讀存儲器有什么特點

    時間:2015-10-12 10:53:27本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 孫勝龍 我要投稿

      現在大家都知道了電腦,我們都知道電腦是由主板、cpu、內存條和顯卡幾個主要的部分組成。但是,你知道內存條為什么叫只讀存儲器嗎?下面學習啦小編帶大家來了解一下什么叫只讀存儲器,它都有什么特點?

      只讀存儲器的英文簡稱是ROM,它所存儲的數據通常都是裝入主機之前就寫好的,在工作的時候只能讀取而不能像隨機存儲器那樣隨便寫入。但是只讀存儲器有隨機存儲器不具備的優點。就是只讀存儲器的所存儲的數據十分穩定,就算斷掉電源也不會進行改變的;只讀存儲器的結構十分簡單,讀出很簡便,一般用于存儲各種的程序與數據的地方。

      只讀存儲器的特點:顧名思義,只能讀取不能隨便寫入信息,它主要是在主板上的rom的里面刻入了一個最基本的輸入或者輸出系統,叫做bios。它的主要功能是:各種功能的模塊進行初始化、對系統的輸入和輸出的驅動程序進行操作和引導、對系統的加電功能進行自動檢測。

      只讀存儲器一般使用在:揮發性的隨機存儲器當中,具有高速存取、讀寫時間等等功能,并且和地址沒有關系,比如計算機的內存條等等。

    只讀存儲器有什么特點

      只讀存儲器的信息斷電之后不會消失,就好像計算器啟動用的芯片bios等等。存取速度不叫低,并且沒有辦法改寫。因為不能改寫信息和升級,現在的逐漸消失在市場中。

      nadn flash的性能和rom的性能差不多,但是它能進行改寫,讀取速度比寫入的速度要快,寫入用的電壓比讀取用的電壓要高,但是flash能在相同的電壓下進行讀寫工作,并且它的容量很大成本相對來說比較低,比如mp3、mp4、優盤等等中使用非常廣泛。在計算機的系統里面,rom通常作為內存來使用,rom能用來存儲固件也就是硬件的驅動程序。

      rom的形式多種多樣,大致分為兩種類型,一種為熔絲型,rom的廠家對產品保留了全部的熔絲陣列,根據使用者的需求來寫入信息,但是寫入之后就不能在進行更改了,這種rom叫做可編程的rom。另一種則是由廠家寫入信息之后,能用電方法進行消除,才能寫入新的信息。

      看過之后相信您對您的電腦里面的內存條等部件有了一定的認識吧。

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