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光盤

名稱:光盤
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江西昌運印刷廠,歡迎您來電咨詢!期待與您真誠合作!
光盤是利用激光原理進行讀、寫的設備,是迅速發展的一種輔助存儲器,可以存放各種文字、聲音、圖形、圖像和動畫等多媒體數字信息。
光盤拼音Guāngpán;定義:即高密度光盤(Compact Disc)是近代發展起來不同于完全磁性載體的光學存儲介質(例如:磁光盤也是光盤)


光盤
,用聚焦的氫離子激光束處理記錄介質的方法存儲和再生信息,又稱激光光盤。
由于軟盤的容量太小,光盤憑借大容量得以廣泛使用。我們聽的CD是一種光盤,看的VCD、DVD也是一種光盤。
一般的硬盤容量在3GB到3TB之間,軟盤已經基本被淘汰,CD光盤的最大容量大約是700MB,DVD盤片單面4.7GB,最多能刻錄約4.59G的數據(因為DVD的1GB=1000MB,而硬盤的1GB=1024MB)(雙面8.5GB,最多約能刻8.3GB的數據),藍光(BD)的則比較大,其中HD DVD單面單層15GB、雙層30GB;BD單面單層25GB、雙面50GB、三層75GB、四層100GB。
光盤的存儲原理比較特殊,里面存儲的信息不能被輕易地改變。也就是說我們常見的光盤生產出來的時候是什么樣,就一直是那樣了。那我們有沒有辦法把自己寫的文章存在光盤上呢?
當然有!只要你有一個CD刻錄機和空的CD-R光盤,就能將自己的“文章”寫在光盤上。其它像DVD等介質的刻錄也是一樣的,要注意的是,絕大部分DVD刻錄機都能刻錄CD,即所謂的“向下兼容”。
說到這里,我們來想一下,光盤是屬于內存儲器還是外存儲器呢?要記住,我們所說的內部存儲器就是內存,而外部存儲器都是可以電腦中拆卸下來的。常見的外部存儲器有硬盤、光盤、U盤、SD(Security Data,數據安全)卡、TF(T-Flash)卡等。
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