Magazine : 
Ultrabook Buying Guide: 6 Things to Notice
What Drives it, Flash or Hybrid?
To make the cost factor low, some of the manufacturers incorporate hybrid storage system which pairs with the flash memory and tradition hard drive. These hybrid drives offers lots of storage and a fast resume time, but they are comparatively bit slow while copying files or opening applications when compares to SSD only Ultrabooks.
Two best examples for hybrid drive ultrabooks are: Acer Aspire S3 that sports a 320GB hard drive along with a 20GB solid state drive and Samsung Series 5 that comes with a 500GB drive and 16GB SSD. So decide which is more important for you, speed or storage? If you are ready to invest big bucks and can live with less storage, then an SSD-only ultrabook is preferred.
