您是否曾经仔细观察过SATA连接器上插件触点的长度，并想知道为什么它们的长度不同而不是相同？为什么？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。

照片由史蒂夫·潘恩（Flickr）提供。

问题

超级用户读者Carl B想知道为什么SATA连接器上有不同的触点长度：

I have looked around, but cannot seem to learn the reason why. On SATA drives (2.5″ and 3″), there are variable lengths of copper contacts on both the data and power ports on the drives. These variati*** do not exist on mSATA drives. Is there a reason why these variable lengths are on all SATA plugs?

为什么SATA连接器上有不同的触点长度？

答案

超级用户贡献者Techie007为我们提供了答案：

The longer pins are ground contacts (“GND”).

Data:

Power:

Ground contacts are slightly longer than data/power contacts on connectors that are designed for regular plugging and unplugging (especially in the case of hot-swap capable interfaces, like SATA) to ensure that the ground contacts are connected before any data/power ones are. This helps prevent electrical discharge into the device when attaching or removing it.

mSATA is an internal, clamp-down, “permanent” connector type, so it is not intended to be plugged and unplugged on a regular basis (by end users), and definitely not while the power is on.

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