The new Thinkpad W520 came with a 150GB solid state hard drive.   I use the SSD for the HOST OS; Windows 7 64 bit Professional.   I ran a few disk performance runs against the SSD, as well as my secondary Seagate 500GB hybrid drive; where all of my virtual machine reside.   I am using the Crystal Disk performance tool.  here are some results.

Here are the results for the primary hard drive; the 150GB solid state drive.

Here are the results for the secondary internal hard drive; the Seagate 500GB hybrid drive, which I also used over the past year in my older Thinkpad T41p.