音频应用程序要使用大量内存，并需要高速硬盘。

Audio applications use a lot of RAM and require fast hard disks.

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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。

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.

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MacBook笔记本配有250G硬盘驱动器，8倍光驱，超高速以太网，2个USB接口，以及与外接显示器相连的迷你显示端口。

The MacBook comes equipped with a 250 GB hard disk drive, 8x "SuperDrive, " Gigabit Ethernet, two USB ports and mini DisplayPort to connect an external monitor.

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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。

哈佛公开课 - 计算机科学课程节选