随着USB3.0越来越流行，你可能会发现自己在想为什么现代电脑仍然内置USB2.0端口。有鉴于此，今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者Brettetete想知道为什么现代电脑机箱仍然有USB 2.0端口：

I am currently planning out the setup for a new computer. As I was browsing through computer cases online, I realized that modern computer cases always seem to have USB 2.0 and 3.0 ports built into the front panel.

Is there a legitimate reason to have or use USB 2.0 ports on modern computer cases? As far as I know, USB 3.0 has backward compatibility. This screenshot is a perfect example of a computer case with both types of USB ports built into it (from YouTube):

为什么现代电脑机箱仍然有USB2.0端口？

答案

超级用户贡献者Kamen Minkov、Patrick Bell和“原始mike western”为我们提供了答案。首先，卡门·明科夫：

USB 3.0 does have backwards compatibility, but if you happen to buy a motherboard that does not have a USB 3.0 header connection, you are left without any front panel USB ports at all. That is one possible explanation.

接下来是帕特里克·贝尔的回答：

Nobody has mentioned this yet, but USB 3.0 ports can cause issues with certain installation media (like Windows 7, for example) where only USB 2.0 drivers are provided on the installation media.

我们的最后一个答案来自“原始迈克·韦斯特”：

USB 2.0 ports are handy for keyboards, mouse controllers, and other non-drive uses. Because these devices do not need the speedy throughput, a keyboard or mouse connected to a USB 3.0 port would be a waste of the resource.

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图片来源：安静！Silent Base 600案例回顾（YouTube）