Fusion Drive

What Does Fusion Drive Mean?

Fusion Drive technology is a pre-built storage option in iMac and the Mac mini. It pairs a mechanical hard drive and solid state disk (SSD) as a logically visible single storage drive or partition.


Developed by Apple Inc., the Fusion Drive storage technology enables the permanent transport and storage of frequently used applications and data from a hard disk drive (HDD) to an integrated flash storage SSD.

Techopedia Explains Fusion Drive

Apple’s Fusion Drive technology is primarily designed to provide faster system access to commonly used data, applications and services. This is achieved through the installation and integration of two different storage drives – a typical rotating HDD and a flash storage device based on SSD technology. Once the iMac or Mac mini system is used, the Mac OS learns and identifies frequently used items and moves them permanently to the flash storage device, whereas in-frequent programs reside in the standard HDD. The whole ongoing process of moving data in and out of the flash drive is invisible to the user, who sees the standard HDD and flash SSD as a single drive.

Fusion Drive is different from disk/data caching techniques, as the former permanently moves data to a faster drive, but the latter replicates or temporarily moves data to a disk cache.


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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.