To see how this influences trade, consider the business of making disk drives for computers.

"想知道这如何影响贸易，可以考虑为电脑制作磁盘驱动器的业务。

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For most computers, this place is the hard disk drive, but files can exist on all sorts of media: flash drives, CD and DVD discs, or even tape backup systems.

大部分来说计算机，这一个地方是硬盘磁碟机，但是文件能在所有的媒体上存在：闪现驾驶、激光唱碟和数字化视频光圆盘，否则甚至以带子绑起预备的系统。

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Currently, HDTVs are compatible with a wide variety of devices via USB connection, including hard drives, cameras, and flash drives, but they do not support optical disk drives built for computers.

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The Archos G9 Android-based tablet computers contain Momentus Thin (7 mm thick) hard disk drives from Seagate Technology rather than flash memory for long term storage.

FORBES: Are Fat Tablets in Your Future?

Apple, for example, has also frustrated hard-disk drive makers by featuring solid state drives across its line of notebook computers and eliminating spinning disks in the MacBook Air, its thinnest, lightest model.

FORBES: Apple's iPad Behind $4.3 Billion Disk Drive Deal