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So on your computer's hard drive are again, a whole bunch of tiny magnetic particles aligned this way or this way.
因此，你的电脑硬盘是完全是,有一簇按照这种方式排列的磁性粒子。
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We're talking about like, if you didn't, even if you had all your data on your computer backed up on hard drive,
如果你没有将你电脑里的数据备份到硬盘里，
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And when you actually wanna store information on disk, can you actually use, as we'll see in a moment, magnetic particles.
当你想在硬盘中存储信息时，我们将会用到后面，我们会谈论的一种称之为磁性粒子来实现它。
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It's the various programs you run on your computer along with the various data files that you have saved on your hard drive,and so forth.
是你自身这个电脑中运行的各种程序,硬盘存有的各种数据和文件，类似种种。
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It's roughly the same size physically as those floppy disks and yet how many, how much, how many bytes fit on a typical hard drive today?
从物理大小上来说几乎相同,那么现在的硬盘的存储大小,一般有多少字节呢？
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All right so it has to live in RAM as opposed to the hard drive because otherwise things would be terribly slow as you know so it's much better if your programs live while they're running in RAM and they end up in what's called the tech segment.
好的，它存在内存中，而不是硬盘中,因为，否则程序会非常的缓慢,程序在内存中运行会好得多,它们在技术段,的地方结束。
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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。
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This is different from the hard disk, which is where files and stuff are permanently stored.
这个和硬盘是不一样的，那是存储,文件之类的东西的。
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We're talking complete irreversible amnesia, complete erasure of the brain's hard drive.
就像是完全不可治的健忘症，完全将大脑这个硬盘格式化。
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RAM You probably know your computer has something called RAM which is where documents and programs live just temporarily while you're running them 'cause RAM tends to be pretty fast and whereas your hard disk is where programs and files live permanently.
也许你知道电脑有一个,正在使用的程序和文件都暂时存放在那里,而且会加快电脑速度,而硬盘是程序和文件,永久存储的地方。
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Even though a hard drive spins at 7200 times per minute or even faster, that's relatively slower than the speed of light.
即使一个硬盘驱动器的转速达到每分钟7200次,甚至更快，仍然比光速慢。
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But what's amazing is that the hard drives we have today in a desktop or in a laptop, a hard drive and a laptop is only about--yey big!
现在你可能对在笔记本或者,台式机中存在的硬盘更感兴趣，其实硬盘仅仅是容量大了一些！
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This is useful especially when we get to details like forensics and looking at data on a hard drive, - 'cause if you don't know how much store-- how many bits are composing your file, you're never gonna recover that data or be able to access what you're looking for.
这是很有用的，尤其是在法庭上,查看硬盘驱动器里的数据时，如果你连-,文件有多少比特都不知道，你如何去恢复数据,获取你想要的信息呢。
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Okay, what are the advantages of SSDs and how do they work.
固态硬盘的优点和工作原理是什么。
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The fan is perhaps the only thing left in those of you who have computers with what are called SSDs.
有趣的是也许你们中有些人,的电脑中是SSD硬盘的。
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And this is because as you start writing--saving files to your hard drive, what happens is you might save this file here, then this one, then this one, then this one, but very reasonably you might go back eventually and delete this one.
这是因为当你开始对硬盘驱动器进行读写时,你可以保存一个文件到磁盘的某处，然后再一个，再一个，又一个，最后你可能回到这,并删除这一个文件。
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The hard drive is where your PC stores most of its permanent data.
硬盘是你的PC存储永久数据的地方。
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What the mad scientist did,in effect was wipe out the hard drive, put in the other programs from the Shelly Kagan computer, but it's still the very same computer.
疯狂科学家所做的实际上是,清理硬盘，输入来自Shelly，Kagan电脑的其他程式，但电脑还是那台电脑。
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But in hard drives where we actually have these moving platters, here is in fact, how we get from electricity and magnetism to those zeros and ones.
但是在传统硬盘中我们确实有高速运转的磁盘，这就是事实，但问题是我们如何,把电磁信号转化为0和1的。
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Other signals move the read/write heads to read or write data on the platters.
其他的信号移动读写头,来到硬盘中去读或者写。
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Now this is mostly irrelevant to what we're talking about except for the fact that there are magnetic particles involved and they're really small because it turns out what's inside most of your laptops and desktop computers are these things called hard drives.
其实这与我们现在谈论的话题没什么关系,除了这里的磁性粒子有关系外,它们是很小的因为它们要放在,你的笔记本电脑或者,台式机中被称为硬盘的里面。
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These in turn control the hard drive's moving parts.
这些反过来控制硬盘的移动部分。
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