When I ordered my Thinkpad, I sprung for the hybrid hard drive, because it's supposed to speed up boot time and sleep mode, and why not? But there was a bug in the driver that, combined with Lenovo's disk protection sensor, would lock up the computer if it was moved too much, so I had to disable the hybrid part.
Intel's new storage drivers fix the problem, apparently by disabling some of the power-saving modes that came with the OS. They also add this amusing option to the advanced power management window:
I can only imagine that they enabled its display solely for the purpose of that darkly cynical tooltip.