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How to fix late 2014 iMac fusion drive not mounting the whole HDD?

A few days back, Disk Utility froze in the middle while I was trying to create a new partition on my late 2014 iMac with a Fusion Drive. Ever since then, the whole HDD will not mount except for the new partition. Disk Utility is useless in repairing the drive. Does any of you have a solution? Thx!

Best Answered by

Jenny Zeng

Answered on Tuesday, August 27, 2024

To fix your Fusion Drive, you can delete the Logical Volume Group and reset it.

Be reminded that all data on your Fusion Drive will be erased in the process. If you need to recover data from the Fusion Drive, use iBoysfot Data Recovery for Mac first.

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When you're ready, follow the steps below to delete the LVG from Terminal:

  1. Open Terminal.
  2. Run the commnad below to find the UUID of your Fusion Drive's Logical Volume Group. diskutil cs list
  3. Delete the LVG.diskutil cs delete UUID

Then take the steps mentioned in the following guide to reset your Fusion Drive based on your macOS version:

Fix Fusion Drive Not Showing Up or Not Working on Mac