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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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Is there any way to recover data from an Apple Fusion drive?

My grandmother’s 2015 27” iMac just recently had its motherboard fail, and she wanted to get all of her data backed up off of it without paying for a new motherboard. Normally this would be very easy to do as all you need to do is pull of the screen and disconnect the hard drive, but when she purchased the machine, she got it with an Apple Fusion Drive instead of a regular HDD or SSD. My question is if there is any way to retrieve the data from the Fusion Drive myself without replacing the iMac’s motherboard and coping the data over to a different disk. As far as I know, there isn’t a very easy way to do this. Any suggestions on what to do?

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@bobsinger I have the same issue. How did you access to the HDD? Did you simply put the HDD in an enclosure as suggested by @danj and it showed up as a normal HDD on another Mac or you had more steps to do?

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@Daniel Beaulieu I want to know also. :D

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I tried mounting the HDD in an enclosure and it didn't work. I had to use another iMac and use both the SSD and the HDD of my fusion drive to get things back.

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@Daniel Beaulieu Thank you. I couldn’t find another Mac, I ended up formatting the disk. 🥺

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There is no such thing as a Fusion Drive device! A fusion drive is two physical devices interconnected into a logical device (SATA HDD and the PCIe SSD)

The SSD is nothing more than a cache drive to the HDD. Holding duplicate data from the HDD as the SSD retrieval is faster!

So if the logic board failed your HDD still has all of the data on your HDD. Removing the drive placing it into a case will allow you to retrieve your grand mothers data. Substituição do disco rígido do iMac Intel 27" com tela Retina 5K

Just be aware an encrypted drive will require the saved key otherwise it’s not possible to recover the data.

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I always knew that a Fusion Drive was two separate drives, but I was always under the impression that data was moved between the two drives, and that there was no master copy on the HDD.

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This is a quote from a website explaining how to recover data from an Apple Fusion Drive: "Data on Fusion Drive gets distributed between the two devices without mirroring or parity calculations and on top of that is heavily fragmented. The metadata needed for its correct reading is located on both components, thus, when separated, each of them becomes unusable from the point of view of data recovery."

You can find the full website here: https://www.ufsexplorer.com/articles/how...

I am not really sure which is right as all of the websites that I visit explaining how to recover data from an Apple Fusion Drive says that the SSD and HDD cannot be separated.

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@bobsinger - The first version was more involved! And you did need to do data recovery using both drives.

Apple redid things! Mojave onwards follows the better design (using APFS) so the SSD is strictly a cache drive having a duplicate of the most active data blocks on it. The update is always done to both drives in tandem so no data is at risk within the HDD other than if the HDD it's self fails!

Fusion Drives are old news now! As SSD prices have dropped so the need it really not there any more.

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@danj Thank you for clearing that up for me! This is good as the iMac was last running Mac OS Big Sur. I'll get it all backed up right away.

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@chriscombs - Please define what the function of the blade SSD in this system.

While most references will talk about L1, L2 and L3 within CPU architecture. Caches also are in OS’s and even other device types as an example a buffer is a kind of cache used in HDD’s and SSD’s.

This ‘Cache’ is unique! It’s within the storage space, similar to how applications cache data. Often called a scratch space within the drives storage.

Here the OS is creating a drive cache element within the SSD. Apple altered Fusion Drive architecture a few times for a few different reasons besides the file system change is that what has you hung up? Data in this context is generic it is not an explicit file, only the altered block elements.

Granted what I wrote didn’t get deep into the mechanics. Keep in mind we are a repair focus site not trying to get into the weeds on how it all works. There is nothing wrong with what I wrote.

There are web sites that get deep into the macOS architecture. I recommend if you want to get deeper into this take the time to read Apples stuff and what others have published.

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Bit of an old thread but since I've got the answer, I thought I'd post.

The answer is yes, it can be sorted out. If the only issue is that the Fusion Drive has been split digitally or you had to manually split the drives due something else on the Mac not working (so they are't in a single container anymore and are greyed out and can't be mounted) but the physical drives themselves are fine, you can 're-fuse' them virtually and then get all your data.

As mentioned above using something like UFS Explorer Professional, you can mount the two disk images creating a virtual RAID which then allows you to see all the files which you can download then. This is because as explained above, the two drives share file data/information between the drives for all the files. So, if one drive doesn't work the files in the other won't be readable, you need both the 'lock and the key' so to speak.

What you need to do is the following go to disk utilities create a 'image' of each disk not the volume or drive. So you should have something like disk0s1 DMG (from the apple SSD) and disk1s2 DMG (for the HDD or SSD if you upgraded/changed it) then you take both of those DMG images into something like UFS and then use the virtual RAID complier to make a single virtual drive which mounts in the software.

Hope this helps everyone.

p.s this video shows step by step, they use the Microsoft image format for the drives, but DMG drive images also work (which you can create in disk utilities as I explained above): https://www.youtube.com/watch?v=HIfx8xPH...

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Hi @bobsinger and @danj

I came across this thread as I just had the same thing happen to my late 2015 iMac. Either the motherboard or graphics card died while exporting a very important project, and now the IMac will not boot at all.

I was running Monterey, so as Dan suggested I pulled the HDD, and put it in an external 3.0 usb SATA case. I connected that to my MacBook (running Mojave) and although the computer sees it via disk utility, it will not mount and only shows it as a greyed out, generic, “Hd1”. Do I need Monterey running on the MacBook too? Any help would be sincerely appreciated. I’m a stressed out mess. Jerry

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@pdn7gxy0ki99uoz - Are you using the same user account? You maybe hitting a drive encryption issue.

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@danj Thanks for responding so quickly, Dan. I am using the same account and I'm quite sure that I didn't encrypt the drive. Do you think that the HDD was damaged in whatever happened to my iMac? I can hear it spin up and as mentioned the computer sees it but will not mount

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@pdn7gxy0ki99uoz - At this point there is no way to recover the data as APFS is unique to Apple and the drive Utility folks don’t have tools to fix them. Best you can try to see if the drive is still working is to just reformat it.

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I just wanted to say that I tried this with the HDD portion of a Fusion Drive that had Catalina installed and it didn't work. I've also tried it with multiple other Fusion Drives running versions of macOS higher than Mojave, and in every case the HDD portion does not mount normally and the data is not readily accessible. In the link provided by Bob Singer above it states that even for systems running Mojave and later, both the SSD and the HDD need to be connected to the system to allow data recovery. https://www.ufsexplorer.com/articles/how...

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@zpl - BACKUPS!

Yes! Fusion Drives are a moving target!

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