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Apple shipped Fusion drives on some iMacs and Mac Minis in the past. It speeds up the drive by combining a fast, smaller SSD Flash Drive and a larger 1TB or bigger Hard Drive.
Sometimes the drives can be split by errors in formatting or crashes.
In this video we show you how to repair this problem and recombine your drives.
**MAKE SURE YOU HAVE A TIME MACHINE BACKUP BEFORE TRYING THIS**
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Commands you will need in this video:
To Fix in Mac OS X Mojave or Higher - diskutil resetFusion
To Fix in Mac OS X high Sierra or earlier:
- diskutil list
- diskutil cs create Name_Your_Drive diskx1 diskx2 (Disk “x1” is the SSD drive you found in “diskutil list”, Disk “x2” is the Hard Drive you found in “diskutil list”)
- diskutil cs list
- diskutil cs createVolume Logical “Volume Group Number” jhfs+ Name_of_Your_Drive 100%
- (You found this number “Logical Volume Group Number” above using “diskutil cs list”)
Fusion Drive is Apple Inc's implementation of a hybrid drive. Apple's implementation combines a hard disk drive with a NAND flash storage (solid-state drive of 24 GB or more) and presents it as a single Core Storage managed logical volume with the space of both drives combined.
The operating system automatically manages the contents of the drive so the most frequently accessed files are stored on the faster flash storage, while infrequently used items move to or stay on the hard drive. For example, if spreadsheet software is used often, the software will be moved to the flash storage for faster user access. In software, this logical volume speeds up performance of the computer by performing both caching for faster writes and auto tiering for faster reads. Basically this is just a regular SSHD because the technology and the functions are the same.
The Fusion Drive was announced as part of an Apple event held on October 23, 2012, with the first supporting products being two desktops: the iMac and Mac Mini with OS X Mountain Lion released in late 2012.[3] Fusion Drive remains available in subsequent models of these computers, but was not expanded to other Apple devices: the latest MacBook and Mac Pro models use exclusively flash storage, and while this was an optional upgrade for the mid-2012 non-Retina MacBook Pro discontinued by Apple, it will replace the standard hard disk drive instead of complementing it in the fashion of Fusion Drive. Supported products have the following configurations:
Mac Mini Late 2012 1 TB 128 GB
Late 2014
iMac
(all models) Late 2012
Late 2013
2014
iMac
(27-inch non-Retina) Late 2012 3 TB
Late 2013
iMac
(27-inch Retina) Late 2014
Mid-2015
iMac Late 2015 1 TB 24 GB
2 TB 128 GB
Mid 2017 1 TB 32 GB
2 TB 128 GB
3 TB
Early 2019 1 TB 32 GB
2 TB 128 GB
3 TB