How do you get data off the hard disk?

怎样从硬盘中得到数据？

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You simply upgrade one disk then boot off it, and when you need to go back to the other version, simply boot off that disk instead.

只需升级一个磁盘，然后从它引导；当需要返回到另一个版本时，只需从另一个磁盘引导。

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For instance, you can allocate memory for caching, which reduces disk access, or access resources over the network rather than reading off the local disk.

例如，可以为缓存分配内存，这可以减少磁盘访问或通过网络的资源访问。

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But in fact, if you just run your fingers again and again over this floppy disk you are disorienting those particles or knocking them off perhaps altogether, depending on the medium.

事实上，如果你把手指一次次的在磁盘上面滑动,这些粒子就会变的无极性,或者把它们整个搞坏，而这取决于媒介。

哈佛公开课 - 计算机科学课程节选

When you're working on a file, it's saving constantly to RAM but also hopefully to disc, the hard disk so you don't actually lose it if the power goes off.

当你打开一个文件，它不断地保存在内存中,但对于光盘，硬盘,当你断开电源的时候，数据不会丢失。

哈佛公开课 - 计算机科学课程节选

How do you get data off the hard disk?

那怎样从磁盘中得到数据？

哈佛公开课 - 计算机科学课程节选

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