The SSD is connected to the sata 3 port. And it works at a speed of 3 Gb / s, how to fix it?

Question

Hard disks

I bought an SSD (SanDisk Ultra Plus) for my laptop (HP Pavilion 15-n028sr). Installed instead of HHD, and HDD, in turn, through an adapter instead of a DVD drive.
And the problem is that when an SSD and HDD are connected to the laptop , then the SSD works at a speed of 3 Gb / s , and when only an SSD (without hdd) - then 6 Gb / s . How to fix this problem? Or at least make sure that the HDD does not start at system startup?
And interestingly, if the laptop stays in sleep mode, then after waking up everything is fine, the SSD is connected 6 Gb / s.
What should be the approximate turn-on speed of the PC (windows 10 pro x64)?

Answer 1

will solve your problem

Answer 2

Got it. Thanks to all.