Why is SATA 6 GB/sec and drives don't support it?

[trollzhxtroll]

I have a 7200rpm HDD and a SSD, all connected to SATA III on my motherboard.
I realized today when I bechmarked my drives that my SSD had a max read of 1683 and a max write of 957. Even if I write and read at the same time, the drive won't reach 6 GB/s. Even the fastest SATA drive in the world (2017) won't reach 6 GB/s.
Can someone explain why manufacturers say this even if their drives can't actually reach this speed.
Or should I ask Linus to make another $h!t manufacturers say...

 

[kanewolf]

it is 6Gb (giga bits) which is about 600MB max. SSDs typically max out at 550MB.

 

[SkyNetRising]

SATA 3 is 6Gbps - gigabits per second.
This equals to 750 MB/s. Sata protocol overhead also takes some bandwidth, so you're left with <600 MB/s.

For mechanical drives max transfer rates are ~ 200 MB/s.