Good as a Fusion Drive is, it will never be as fast as a pure SSD, and you’ll probably notice that most when working with older files. In essence, the Fusion Drive provides much of the speed of an SSD along with the capacity of a hard drive. The user sees just a single volume, but behind the scenes, macOS automatically and dynamically moves frequently used files-notably those used by the operating system-to the flash storage portion of the Fusion Drive for faster access while keeping infrequently used files on the hard drive. As its name suggests, a Fusion Drive melds a hard disk drive with flash storage to provide the best of both worlds. In 2012, Apple came up with a compromise: the Fusion Drive. But chips are more expensive than hard disk platters and read/write heads, so the $250–$300 that will get you an 8 TB hard drive is enough for only a 1 TB SSD. Because SSDs rely on flash storage, a type of non-volatile memory whose chips retain data without power, they’re lightning fast. However, they’re relatively slow.įor speed, you want a solid-state drive, also known as an SSD. For the lowest cost per gigabyte, you can’t go wrong with a hard drive, and they come in truly massive sizes-up to a whopping 8 terabytes. There are two basic types of storage devices available today: hard disk drives and solid-state drives.
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