![]() ![]() This keeps plenty of flash storage available so that high performance is maintained. When free flash storage dwindles to only 4GB, OS X's long-term observations are used to decide what you're least likely to need from day to day, and it moves some of it to the hard drive. As long as plenty of free flash storage is available, OS X doesn't touch the hard drive, and the Mac will operate solely from its flash storage.īehind the scenes, OS X silently monitors how your Mac is used. When something needs to be stored, it's always first written to the flash storage. Neither of the drives holds a complete copy of everything. No adjustment needs to be made to how you work, as decisions about which of the two components is used to store a given piece of information are made for you. How does Fusion Drive work?Ī Fusion Drive's components appear as a single volume in the Finder, with their capacities merged. A copy of everything is on the hard drive. A hybrid drive's flash portion acts as a cache, but that's all it is: a cache. Nor do they work like hybrid drives, available on PCs for several years, despite their similar makeup. The two drives that make up a Fusion Drive don't operate like a striped RAID array to spread the load between them.
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