The new Black-series "SSHD" from Western Digital hybrid device pairs solid state cache with mechanical platters in an attempt to deliver the best from both worlds, you get a significant p... Western Digital SSHD pairs SSD cache with HDD
I am currently using this technology in raid configurations on enterprise servers. I have a SSD "cachecade" raid 1, which takes all the caching responsibilities from the other raids that I assign. This is all done from both firmware and software. It is still pretty buggy, but when it does work, you can really see the difference.