Help with Fusion drive in iMac 2019!!

Sensamic

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Original poster
Mar 26, 2010
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Yesterday I was trying to install Windows 10 through Bootcamp and it froze during the partition process, so then I tried to delete the new partitions created and it didn't let me. Searching online I tried a lot of things and seems like finally it worked and everything is back to normal... or so I think, but can't verify it.

Can someone tell me if this screenshot shows the correct way Fusion drive appears in Disk Utility?

I'm worried I messed up the Fusion drive with so many restores and deletes I tried... Now I don't know if it is back to normal or somehow I changed it... which seems can occur from what I read online.

Does everyone else with a Fusion drive with the 2019 iMac has the same appearance in Disk Utility?

Does Fusion drive appear as one drive or two in Disk Utility?

https://imgur.com/ZV67rUs

https://cdn1.imggmi.com/uploads/2019/7/9/2d2d13a8205133de544bb73437077a23-full.jpg

Thanks!
 

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Sensamic

macrumors 68030
Original poster
Mar 26, 2010
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This is what diskutil list command in terminal shows:

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 28.0 GB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk2 27.6 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3


/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_APFS Container disk3 898.0 GB disk1s2

3: Microsoft Basic Data BOOTCAMP 102.0 GB disk1s3


/dev/disk2 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +27.6 GB disk2

Physical Store disk0s2


/dev/disk3 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +898.0 GB disk3

Physical Store disk1s2

1: APFS Volume MacOS 44.0 GB disk3s1

2: APFS Volume Preboot 46.3 MB disk3s2

3: APFS Volume Recovery 509.7 MB disk3s3

4: APFS Volume VM 4.3 GB disk3s4




Does it show like everything is working or Fusion drive has stopped working?
[doublepost=1562637935][/doublepost]
I think you may have broken something.

I've attached a screenshot of what my fusion drive looks like - it's labelled as fusion drive.
Thanks!

I may have to call Apple to resolve this, or maybe follow the guide in their website to restore fusion drive.
 

vinesy

macrumors newbie
Feb 26, 2017
9
9
In diskutil list, a fusion drive comes up as a "synthesized" disk. It looks to me that you have two "synthesised" disks = 2 fusion drives.
 

nambuccaheadsau

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Oct 19, 2007
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Nambucca Heads Australia
To delete the BootCamp partition one must use the BootCamp Assistant. If you did not you may be in for an erase of the hard drive and a clean install. Did you print the BootCamp instruction page before beginning or just charge in and on?
 

wardie

macrumors 6502
Aug 18, 2008
317
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Although I am not using a fusion drive (and thus slightly different use case) I did have the same problem on a recent Bootcamp install. The first couple of times I tried it via Bootcamp Assistant it hung for ages at the partition stage (30+ mins) and then eventually said it had failed. The first time it left me with a smaller macOS partition. The second time it failed again but correctly restored the drive to its original state. The third time it worked. I was getting a bit nervous until then! During this I was observing what it was doing with diskutil but not using it to change anything.
Unless its too much hassle you could try:
1. Take a backup of the windows partition with winclone tool
2. Use Bootcamp assistant to zap the windows partition
3. Check the setup to see if it looks like normal fusion configuration (others can hopefully show you this)
4. Repeat install via Bootcamp Assistant
5. Don’t re-register the new windows at install time.
6. When its done initial install, use winclone to restore your original setup.
That way you may avoid any dumb MS licensing issues with validating a “second” install.
 

Sensamic

macrumors 68030
Original poster
Mar 26, 2010
2,598
280
To delete the BootCamp partition one must use the BootCamp Assistant. If you did not you may be in for an erase of the hard drive and a clean install. Did you print the BootCamp instruction page before beginning or just charge in and on?
I followed an online guide to install Windows through Bootcamp and then another guide to delete the partition through Bootcamp assistant, but it didn't work, so had to try other ways until it finally went away, but now the problem is Fusion drive not working as intended.
 

Sensamic

macrumors 68030
Original poster
Mar 26, 2010
2,598
280
Although I am not using a fusion drive (and thus slightly different use case) I did have the same problem on a recent Bootcamp install. The first couple of times I tried it via Bootcamp Assistant it hung for ages at the partition stage (30+ mins) and then eventually said it had failed. The first time it left me with a smaller macOS partition. The second time it failed again but correctly restored the drive to its original state. The third time it worked. I was getting a bit nervous until then! During this I was observing what it was doing with diskutil but not using it to change anything.
Unless its too much hassle you could try:
1. Take a backup of the windows partition with winclone tool
2. Use Bootcamp assistant to zap the windows partition
3. Check the setup to see if it looks like normal fusion configuration (others can hopefully show you this)
4. Repeat install via Bootcamp Assistant
5. Don’t re-register the new windows at install time.
6. When its done initial install, use winclone to restore your original setup.
That way you may avoid any dumb MS licensing issues with validating a “second” install.
Thanks for the help!

I will can Apple because I can't seem to find a way to reset the Fusion drive back to normal.
 

Sensamic

macrumors 68030
Original poster
Mar 26, 2010
2,598
280
Called Apple and they helped me fixed it. Great support.

Also found a YouTube video where it explains the same process. All better now, but didn't expect the Fusion drive was so complicated.
 

wardie

macrumors 6502
Aug 18, 2008
317
92
Called Apple and they helped me fixed it. Great support.

Also found a YouTube video where it explains the same process. All better now, but didn't expect the Fusion drive was so complicated.
Could you share what you had to do please?