
The software that controls the Fusion Drive looks for data that you frequently use. Again, the user can’t tell that there are two drives, or where a particular file or application is stored, and 128GB (the size of the SSD in the Mac mini’s Fusion Drive) is plenty of room for the OS and programs. When you purchase a Mac with an optional Fusion Drive (currently, a Fusion Drive is a $250 upgrade to the $799 Mac mini), the OS and all of the applications that ship with a new Mac are loaded onto the flash portion of the Fusion Drive. Fusion Drive technology takes care of the housekeeping for you, letting you spend more time working and less time organizing. But usually these drives are two separate volumes, and trying to figure out where you should put your files and apps can be complicated. Many people who want both speed and capacity already use a combination of solid-state drives and hard-disk drives. What is the purpose of a Fusion Drive? About This Mac: OS X 10.8.2 displays the Fusion Drive as ‘Hard Drive + Flash Storage’. The user, and the applications on the Mac, see the Fusion Drive as a single drive. Apple uses software to create a single volume out of the two drives, but the result is not a

A Fusion Drive consists of two separate drives-one hard drive and one solid-state drive-that are “fused” together.
