More future ultrabooks could have hybrid storage
 

If you've followed the recent ultrabook releases, you might have noticed that Acer's Aspire S3 features 20GB of solid-state storage and 320GB of mechanical storage. Some other ultrabooks ship with only SSDs, but according to DigiTimes, hybrid solutions may win out as ultrabooks seep into the mainstream.

http://techreport.com/discussions.x/21845