By Sophia | Last Updated
With the continuous development of SATA technology, the bandwidth of SATA has also developed from 1.5Gbps，3Gbps to SATA 3's 6Gbps. The corresponding theoretical maximum transmission speed has improved from 187.5MB/s，375MB/s to 750MB/s.
Some readers may be wondering, how could 6Gbps on bandwidth be as low as 750MB/s in theory?
Let's first clarify the difference between 6Gbps and 750MB/s.
The description object of Gbps is bit, 1Gbps=10^9bit/s. The description object of MB/s is byte, 1MB/s=10^6B/s.
In computer, 8 bits form a byte, that is 8bit=1B. And now we carry out the conversion from 6Gbps to 750MB/s:
6Gbps*1000=6000Mbps， 6000Mbp/8=750MB， 6Gbps=750MB/s.
We can clearly see that the converted SATA 3 rate is 750MB/s. But when we use SATA 3 SSD， why the highest rate is only 550MB/s?
Let's introduce the transmission loss.
Although the SATA 3 interface supports 750MB/s bandwidth, in reality, the transmission rate will be affected by various parts of the system like the SSD's main control chip, storage particle type, disk file fragmentation, etc. All of this will reduce the final transmission speed. So 750MB/s is reduced to 550MB/s usually.
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