Fusion Drive issue

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Fusion Drive issue

hi

I can't quite figure this out, I'm sure it's simple, well, maybe.

I have a 2015 iMac, I erased the hard drive to start again, I had some issues getting to restart after erase the hard drive. I eventually managed to get it to reinstall MacOs, it's loaded El Capitan.

But when running, it only sees the SSD, 23gb drive, not the entire Fusion Drive, or even the HDD seperately in Finder.

So, looking at the disk utility, that doesn't seem right, but not sure how best to resolve this.

Also, I cannot access the Terminal from disk utility on recovery mode.

I don't believe there is any issue with the HDD, it's just that the partitions are wrong? I'm assuming/hoping, once I resolve the partitions in disk utility, then the Fusion Drive might start operating normally?

Thanks for any help.

Posted on Mar 30, 2023 1:12 PM

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Answer 1

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Old Toad

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210,831 points

Mar 30, 2023 1:24 PM in response to MikalUK

See if this Apple document helps: How to fix a split Fusion Drive - Apple Support (CA)

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Answer 2

MikalUK Author

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Mar 30, 2023 1:44 PM in response to Old Toad

Thanks, yes saw that page, but I don't get the option for Terminal when in recovery, and disk utility. Nowhere to be found!

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Answer 3

MikalUK Author

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6 points

Mar 30, 2023 1:58 PM in response to MikalUK

I tried using Terminal in normal start up anyway, since couldn't access/find in recovery mode, and at step 2, it couldn't unmount disk, presumably because I'm not in recovery mode. Although, I can now see the HDD as well as the SSD, so a step in the right direction, I couldn't before.

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Answer 4

MikalUK Author

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6 points

Mar 30, 2023 2:43 PM in response to Old Toad

Thanks for the responses Toad. The mistake I was making was not entering the correct recovery mode. I was holding Cmd R, and not Cmd, shift, Option R. When I did that I had access to the terminal in recovery mode, which then meant the instructions worked, and looks like I have 1 HD, full size.

Just downloading various os updates

thanks very much for the responses.

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Answer 5

Old Toad

Level 10

210,831 points

Mar 30, 2023 2:03 PM in response to MikalUK

If you boot into Recovery mode you should see something like this:

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Fusion Drive issue

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