2nd HDD works but doesn't show up on BIOs

[Vorpike]

I have a 2nd HDD that doesn't show up when I plug it via SATA into my laptop, but does via USB, and it works in other devices.

 

[neo_classical]

Is it a case that as USB transfers power as well as data and SATA does not, that it needs an extra power source to run?

 

[Rami Zerker Reini]

It needs 2 SATA cables, SATA power and SATA data, did you have both plugged in?

 

[Vorpike]

Is it a case that as USB transfers power as well as data and SATA does not, that it needs an extra power source to run?

Yes, I'm using a 12V dock, could it be the dock's fault?

 

[Vorpike]

It needs 2 SATA cables, SATA power and SATA data, did you have both plugged in?

Yes...it's a laptop, you have no choice but to plug them both it.