I’ve long been an enthusiastic user of fusion drive. So I own a 5k iMac with a 3TB fusion drive since 3rd June 2015. However, the fusion drive started showing issue just after 2 1/2 years of use. I’ve read enough about bad Fusion Drives to prepare upgrading it to SSD.

Screen Shot 2017-12-30 at 5.11.26 PMScreen Shot 2017-12-22 at 1.07.40 PM

The iMac specification is 5K, 27 inch, late 2014. The memory was also DIY upgrade with 32.0GB OWC Memory Upgrade Kit from  OWC.comScreen Shot 2019-07-01 at 11.24.32 PM.png

Items used for this DIY

  • Anti-Static Mat / 60 cm x 120 cm
  • OWC DIY Upgrade Bundle for 2012 or later 27″ iMac’s factory HDD: 2.0TB OWC Mercury Electra MAX SSD. Includes the NewerTech AdaptaDrive, components and tools to upgrade a 2012 or later 27″ iMac’s factory HDD with a high performance; 3 Year OWC Limited Warranty. (OWCK27IM12HE2TB)


The SSD drive upgrade went well and as plan! However, I have 1 issue. Time Machine Restore failed horribly. Fortunately, all data & work files are stored in my external Raid 5 Thunderbolt storage. After several tries with restore failed, a Clean Install of macOS High Sierra was performed without hesitation. 


Since the iMac version I own has only 2 thunderbolt port, the following devices are connected for expansion.

  • Sonnet Echo Express SE I Thunderbolt 3 to Full-Height/Half-Length PCIe Card Expansion System and the Tempo™ SATA Pro 6Gb 4-Port eSATA host controller.
  • OWC Thunderbolt 2 Dock

All equipments are protected by reliable APC UPS.


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