是什麼阻止dvd+r光碟重新格式化？

雖然眾所周知，DVD+R和CD+R光碟只能燒錄一次，但您可能想知道為什麼這與“RW”光碟的可重寫特性相反。是什麼阻止了“R”光碟的重新格式化？今天的超級使用者問答帖子回答了一位好奇的讀者的問題。...

雖然眾所周知，DVD+R和CD+R光碟只能燒錄一次，但您可能想知道為什麼這與“RW”光碟的可重寫特性相反。是什麼阻止了“R”光碟的重新格式化？今天的超級使用者問答帖子回答了一位好奇的讀者的問題。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

圖片由psc631798uk的Trans-tography（Flickr）提供。

問題

超級使用者閱讀器Ankush想知道是什麼阻止DVD+R光碟重新格式化：

It interests me how, no matter what computer I put a DVD+R disc in or the system installed on said computer, I am unable to format it (I know that DVD+R discs are made to be written to only once). I am guessing that it is a hardware thing, but even so, what stops a computer from ignoring the rules and formatting the disc anyway?

什麼可以阻止DVD+R光碟重新格式化？

答案

超級使用者貢獻者Jonno為我們提供了答案：

Put in fairly simple terms and based on my understanding of it (I could be slightly wrong about the actual manufactured materials), I believe the process goes as follows:

Pre-recorded discs have **all holes in the surface that will prevent the reading laser from being reflected, giving you a reading of a 0 or a 1.
Recordable discs have a dye that can be burned through by a disc drive’s writing laser. The gaps in the dye now work the same way as a pre-recorded disc would, representing a 0 or a 1 based on whether it is reflected back or not. Once this dye has been burned through, it cannot be physically recorded over again (although you could burn out the entire surface, but not make anything useful).
Rewritable discs use a type of metal surface (instead of a dye) that can be changed by the writing laser (depending on the power of the laser used on it). This makes the metal layer reflect differently where the laser has been, and can be “reset” by a differently powered laser.

As such, a writable disc is permanently “set” by a writing laser with no way to reset the damage it does to the dye (in order to write the data).

Further Reading: All about CD-R and CD-RW (Albeit Related to CD-R/RW Technology)

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發表於 2021-04-09 20:43
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