The Fusion drive technology was presented by Apple at its 2012/10/23 day product launch. This technology can make the performance of the hard disk close to SSD solid-state drives, but it can provide more storage space.
Fusion Drive Technology is a 128GB solid-state hard disk with 1TB or 3TB of mechanical hard disk in a hard disk volume, but can provide faster read and write speed, and mountain lion system seamless integration.
Fusion drive technology automatically put the use of low frequency software on the slow storage hard disk, and will often use the software on the solid-state drive, which can improve speed, but also for us to increase the storage space.
Apple's chief marketing officer, Phil Schiller, said the Fusion drive technology performance was very close to the solid state drive.
Apple's imac and Mac Mini, released in 2012/10/23, used Fusion drive technology.