Re: Question: SSD speed

[Alberto Sentieri <22t@tripolho.com>]

Just a small correction: it I believe SATA uses 8B/10B protocol, which 
means each byte uses 10 bits on the serial channel.

On 10/7/20 5:56 AM, Jeremy Nicoll wrote:
> On Wed, 7 Oct 2020, at 09:39, Hans wrote:
> > Hi folks,
> >
> > I have a little question. Smartctl is telling me, that my ssd drive is 6Gb/sec
> > capable, but the actual speed is only 1,5GB/sec.
> If your SATA (presumably) connection from the machine to the SSD is a
> 6 Gbps one, the maximum data transfer speed in bytes across that
> connection would be one eighth of that (as there's 8 bits per byte), so
> about 760 MBps.
>
> That's about half of your "1,5GBps".  That makes me wonder if your
> SSD uses two SATA channels at once - is that even possible?
>
> Alternatively, do any SSDs compress data before sending it across the
> SATA channel?