Wow - there seems to be a lot of confusion around the SATA piggy backing off of the USB 2.0 port by using a USB 3.0 physical port.
Frankly, if you're confused as to what this is - don't worry about it, you don't need it in order to use the Pyra.
What it is: A USB 3.0 physical port has more data lines than a USB 2.0 port. The port on the Pyra is a physical USB 3.0 port jack, but only has the USB 2.0 data lines being used for USB. The -other- data lines on the physical USB 3.0 port are wired to the SATA connection on the SoC. This way, with a simple adapter, the Pyra can directly 'see' a SATA device connected to these data lines. This is -not- a USB to SATA adapter. It is the Pyra being sneaky and using a more complex port to double the functionality of the physical space the port occupies.
Does that help?
I am quite aware of all that, and there was never any confusion on my part about it. What I wondered about, specifically, was that, since the adapter appears to have a regular internal SATA port, why would anyone expect it to furnish power since internal SATA ports never furnish power to the drive? The only kind of SATA port that furnishes power to the drive is eSATAp. You can't tell the difference between a powerless eSATA port and a powered eSATAp port by looking at the outside of the port, so some might expect an eSATA port to furnish power when it actually didn't. Since the port appears to be a regular internal SATA port, there are no power lines to be missing power. There's no need to explain that the power lines are missing on an internal SATA port.
Perhaps the port on the adapter was intended to be an eSATA port, but that could not be sourced, so the explanation about the missing power lines is for a port they ended up not being able to use anyway. It would be more convenient if it were an eSATA port, even without power, but if they couldn't acquire the parts, the internal port that is on the adapter is better than nothing.
Edit: It looks like shielded cables with an internal SATA plug at one end and an eSATA plug at the other are not that hard to find, so it shouldn't be a big deal that the port is not eSATA.
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