An annoying screen after adding a SSD hard drive

Even if you're not using RAID, it appears that the SATA Operation of that system is set to RAID mode to enable the Intel Rapid Storage controller.  The reason that screen is popping up now is because now that you have multiple disks, you would be able to set up RAID if you wanted to, and that prompt is your opportunity to do so.  It would have been skipped when you only had a single disk installed because obviously you can't set up RAID with one disk.

If you switch your SATA Operation in the BIOS to AHCI mode, the Rapid Storage controller would be disabled, and therefore that screen won't pop up -- but that setting is only meant to be changed prior to installing an OS.  Changing that setting will cause any OS installed while it was in the previous setting to no longer boot.  There are apparently steps that you can perform in order to "transition" an existing OS over to use the other SATA Operation mode that involve taking some steps upfront and going through Safe Mode once or something, but I hadn't looked into that in detail.