Have you just learned the difference between Well, get ready to throw all of that out because the USB Implementors Forums (USB-IF) just announced USB 4 and it will trump them all.

您是否刚刚了解了之间的区别 好吧，准备好把所有这些都扔掉，因为USB实施者论坛(USB-IF)刚刚宣布了USB 4，它将胜过所有USB 4。

USB moves fast, both in a “transferring your data” sense and in a “the standards have changed again” sense. The USB-IF just recently announced new naming schemes for USB 3.2, the latest USB spec that promises data transfer speeds up to 20 Gbps. But as fast as USB 3.2 is, Thunderbolt 3, a three-year-old USB standard, boasts twice the speed at 40 Gbps. USB 4 will change that by offering the same speeds.

USB在“传输数据”和“标准再次改变”的意义上都发展Swift。 USB-IF最近刚刚宣布了USB 3.2的新命名方案，这是最新的USB规范，承诺数据传输速度最高可达20 Gbps。 但是，具有三年历史的USB标准Thunderbolt 3和USB 3.2一样快，拥有40 Gbps的两倍速度。 USB 4将通过提供相同的速度来改变这种状况。

雷电是专有且昂贵的 (Thunderbolt was Proprietary and Expensive)

If you’re wondering why Thunderbolt 3 doesn’t already dominate the USB field, the answer is cost. Intel created Thunderbolt 3, and anyone who wants to use it (whether it be a flash drive, the port in your laptop, or a cable) has to pay a royalty feed to gain certification. That fee means the price of anything related to Thunderbolt goes up, and other USB specs remain cheaper by comparison. That’s why you’ll find Thunderbolt in your premium MacBook but not in a $300 laptop. The cost is prohibitive, and that’s just one reason why .

如果您想知道为什么Thunderbolt 3尚未主导USB领域，那么答案就是成本。 英特尔创建了Thunderbolt 3，任何想要使用它的人(无论是闪存驱动器，笔记本电脑中的端口还是电缆)都必须付费使用才能获得认证。 该费用意味着与Thunderbolt相关的任何东西的价格都会上涨，而其他USB规格相比则仍然便宜。 这就是为什么您会在高级MacBook中找到Thunderbolt的原因，而不是在300美元的笔记本电脑中找到Thunderbolt的原因。 成本令人望而却步，这就是为什么原因之一。

But Intel wants a wider adoption of Thunderbolt, and in pursuit of that announced it would open up the spec. USB 4 came out of that drive. According to the , USB 4 will offer the same speed as Thunderbolt through the use of two 20 Gbps channels. High speeds like this will make running external displays and external graphics cards more feasible and, without those royalty fees, less expensive. And as usual, USB 4 will be backward compatibility with USB 3.2, USB 2.0. However, because of the of Intel’s technology, USB 4 will also be backwards compatible with Thunderbolt 3.

但是英特尔希望更广泛地采用Thunderbolt，为了实现这一目标，英特尔宣布将开放该规范。 USB 4从该驱动器中出来。 根据说法，USB 4将通过使用两个20 Gbps通道提供与Thunderbolt相同的速度。 这样的高速运行将使运行外部显示器和外部图形卡更加可行，并且无需这些使用费，也可以降低成本。 和往常一样，USB 4将向后兼容USB 3.2，USB 2.0。 但是，由于采用了英特尔的技术，USB 4也将向后兼容Thunderbolt 3。

Another benefit should be the cost of USB 4 devices. Since creating USB 4 won’t require a paying a royalty fee to Intel, the overall cost of USB 4 products should be lower than Thunderbolt 3 devices.

另一个好处应该是USB 4设备的成本。 由于创建USB 4不需要向Intel支付使用费，因此USB 4产品的总体成本应低于Thunderbolt 3设备。

Keep in mind though, obtaining these speeds means a refresh of all hardware. It’s not enough to have a USB flash drive capable of 40 Gbps, the port you plug it into also to needs to match that capability. If you plug a USB 4 drive into a USB 3.2 2×2 drive, you’ll be limited to the port’s top speed (and visa-versa).

但是请记住，获得这些速度意味着要刷新所有硬件。 仅具有40 Gbps的USB闪存驱动器是不够的，插入它的端口也需要匹配该功能。 如果将USB 4驱动器插入USB 3.2 2×2驱动器，则将受到端口最高速度的限制(反之亦然)。

这只是具有基本信息的规范草案 (This Is Just a Draft Spec With Basic Information)

Unfortunately, what we don’t know is…anything else. For instance, Intel says it will continue offering Thunderbolt 3 alongside USB 4, so it stands to reason it will provide benefits that USB 4 does not, what those benefits are have been left unsaid.

不幸的是，我们不知道的是……其他。 例如，英特尔表示将继续与USB 4一起提供Thunderbolt 3，因此可以说它会提供USB 4不会提供的好处，而这些好处尚未说明。

We also don’t know when we’ll see the first USB 4 products. Finalized specifications for the USB 4 standard won’t come until the middle of the year, at the soonest, and only from there should manufacturers start creating USB 4 products.

我们也不知道何时会看到第一个USB 4产品。 USB 4标准的最终规范最快要到今年年中才会出现，只有制造商才能从那里开始制造USB 4产品。

And the other thing we don’t know? The final naming. If you’re hoping it will be called USB 4, don’t hold your breath. Naming often comes later, as seen with USB 3.2 2×2, which the USB-IF initially referred to as USB 3.2. But when all those details are sorted out, and the dust settles, it may be possible that the long promise of ‘one port to rule them all’ with USB-C may finally come true.

还有我们不知道的另一件事？ 最终命名。 如果希望将其称为USB 4，请不要屏住呼吸。 如USB 3.2 2×2(USB-IF最初称为USB 3.2)所示，命名通常会在以后出现。 但是，当所有这些细节都整理好了，尘埃落定之后，USB-C的“一个端口可以统治所有端口”的长期承诺可能最终会实现。

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