Looking at these Seagate hybrid drives that bundle SATA harddrive + on drive SSD.
ST1000DX001, ST2000DX001 and ST4000DX001
These are 3.5" drives, 7200RPM and 64MB of cache.
http://www.amazon.com/Seagate-Desktop-Solid-Hybrid-ST2000DX001/dp/B00EIQTKAS
Anyone tried these in their workstations...