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发布于2012年10月23日。酷睿i5或酷睿i7处理器。配备Apple Fusion Drive.

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Not seeing 128 gb SSD from Fusion Drive after upgrading HDD to SSD

Macmini6,2 non-server (2.6 GHz Core I7) with 1 TB Fusion drive.

I upgraded the HDD in the lower bay to an SSD and installed Mojave on the SSD. That all works fine, but in disk utility I don’t see the 128 GB SSD that should be part of the Fusion drive.

Instead “diskutil info -all” reports a 1 TB drive as disk0, located in bay “upper”, with “Solid State: no”, so a rotational drive.

So I’m baffled. I did not have a Macmini6,2 server model. It always reported a capacity 1 TB Fusion drive. I never saw a second HDD in disk utility.

The HDD that was in the lower bay is now sitting in an external enclosure and contains all the original data I expect it would.

Anyone have any thoughts about what might be going on here? If you split the Fusion drive, what does diskutil report as the location for the SSD?

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The reason is the fusion drive’s SSD is still tied to the HDD you took out.

So lets back wind things, put the HDD back in so you can then break the Fusion Drive set. Then you can plug in your replacement SSD back in.

Once you break the fusion drive the Fusion drive’s SSD will now be visible. Remember the SSD in a Fusion Drive is hidden! As it’s not accessible to you! It’s accessible to the mated HDD for caching.

Now the next piece of the puzzle!

The 128 GB SSD is not very useful here, too small for a boot drive! I would take it out and use it in a drive case for a backup or transfer drive.

I would put the HDD back in! Now use the system in a two drive setup! The SSD will be your OS boot drive, apps, Virtual RAM, cache and scratch drive (if your app uses it). Then hold your media files and other more static stuff on the HDD. That way you get the most performance out of your drives.

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Thanks for the answer. I ended up taking off the plastic on the drive I took out and discovered that I'd taken out the SSD. For some reason, my unit had the SSD in the lower bay and the HDD in the upper bay, which was apparently not normal, but not unheard of. So I think I'll do as you suggest and just leave it as is.

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Kurt Olender 将永远感激不已
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