sata3极限速度_SATA 3的实际速度是多少？
sata3极限速度
When researching about the speed of SATA 3, the “stated speed” and the “actual result” are noticeably different, so what exactly is going on? Today’s SuperUser Q&A posts helps a curious reader understand more about how SATA 3 works.
在研究SATA 3的速度时，“规定速度”和“实际结果”明显不同，那么到底发生了什么呢？ 今天的SuperUser Q＆A帖子可帮助好奇的读者进一步了解SATA 3的工作原理。
Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.
今天的“问答”环节由SuperUser提供，它是Stack Exchange的一个分支，该社区是由社区驱动的Q＆A网站分组。
Photo courtesy of GiocoVisione (Flickr).
问题 (The Question)
SuperUser reader Space Ghost wants to know what the actual speed of SATA 3 is:
超级用户阅读器Space Ghost想知道SATA 3的实际速度是多少：
Google says it is running at 6 Gb/s. The throughput is at 600 MB/s. 600 MB/s equals 4.8 Gb/s. Does this mean that the bandwidth is 6 Gb/s, but the actual throughput is 4.8 Gb/s ?
谷歌称其运行速度为6 Gb / s。 吞吐量为600 MB / s。 600 MB /秒等于4.8 Gb /秒 这是否意味着带宽为6 Gb / s，但实际吞吐量为4.8 Gb / s？
What is the actual speed of SATA 3?
SATA 3的实际速度是多少？
答案 (The Answer)
SuperUser contributor MariusMatutiae has the answer for us:
超级用户贡献者MariusMatutiae为我们提供了答案：
Does this mean that the bandwidth is 6Gb/s, but the actual throughput is 4.8 Gb/s ?
这是否意味着带宽为6Gb / s，但实际吞吐量为4.8 Gb / s？
Yes it does. It is interesting to understand why.
是的，它确实。 理解为什么很有趣。
While data is actually sent at 6 Gb/s, it is encoded to counteract two common defects in telecommunications, DC Bias and Clock Recovery. This is often accomplished using a specific coding algorithm called 8b/10b Encoding. It is not the only encoding algorithm which has been devised to this end (there is also a Manchester encoding), but it has become the de facto standard for SATA data transfer.
实际以6 Gb / s的速度发送数据时，对数据进行了编码以抵消电信中的两个常见缺陷，即DC Bias和Clock Recovery 。 这通常使用称为8b / 10b Encoding的特定编码算法来完成。 它不是为此目的设计的唯一编码算法(还有曼彻斯特编码)，但它已成为SATA数据传输的事实上的标准。
In 8b/10b encoding, eight bits of signal are replaced by 10 bits of (signal + code). This means that, out of the 6 Gb the channel sends in a second, only 8/10 (4/5) are signal. 4/5’s of 6 Gb is 4.8 Gb, which in turn equals 600 MB. This is what degrades the 6 Gb/s channel into a mere(?) 600 MB/s channel.
在8b / 10b编码中，信号的8位被10位(信号+代码)代替。 这意味着，在每秒发送的6 Gb通道中，只有8/10(4/5)个信号。 6 Gb的4/5为4.8 Gb，即等于600 MB。 这就是将6 Gb / s通道降级为仅600 MB / s通道的原因。
The advantages obtained by compensating for DC bias and allowing for Clock Recovery more than compensate for this slight degradation.
通过补偿直流偏置并允许时钟恢复而获得的优势远远超过了对这种轻微退化的补偿。
Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.
有什么补充说明吗？ 在评论中听起来不错。 是否想从其他精通Stack Exchange的用户那里获得更多答案？ 在此处查看完整的讨论线程 。
翻译自: https://www.howtogeek.com/219685/what-is-the-actual-speed-of-sata-3/
sata3极限速度