Problems with Catalina; not recognizing my drives as 'dual' but fusion

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

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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Alican @alican43

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Problems with Catalina; not recognizing my drives as 'dual' but fusion

I was using dual drive setting in my iMac late2015 27” (512GBSSD and 1TB hard-disk). My start-up disk was SSD and I was using hard-disk for holding data and storage. I was using Bootcamp’ed Windows as well without any problems.

Now I’ve upgraded to Catalina, Bootcamp won’t let me install Windows stating the error; ‘Boot Camp cannot be installed to a split Fusion drive. In order to install Boot Camp please restore your drives to fusion’

I was not using any Fusion Drive setting to begin with…Why catalina is not recognizing my drives ‘dual’ but instead it recognizes them as ‘split fusion drive’. Can anyone help me?

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MacSSD is listed twice! Is this a third party SSD like OWC or Transcend?

9 de out de 2019 por Dan

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Dan @danj

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Your volumes look a bit odd. I haven’t installed Catalina yet so I don’t know why it made a difference if you had already setup a dual drive config with BootCamp working.

The only thing I can think of is this was a Fusion Drived setup but you hadn’t broken the fusion set before altering things. See if this allows you to break the config Split Your Fusion Drive Apart.

You may need to scratch the drives and start afresh to get things working.

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Thanks for the answer Dan

To answer your first comment: Nope, it is Apple proprietary Samsung SSUBX drive. I also do not understand why it is listed as twice…

To your second comment: I used to have 32Gb SSD + 1TB HD Fusion set-up..I splitted the fusion drive set-up then open the screen to swap 32GB for 512 GB SSUBX. I’d made 512 ssd my start-up disk and set the 1TB HD as an another hard-disk. I was using this setting without any problem; even started to use Boot Camp’ed Windows and everything was smooth until I upgraded to Catalina…

How do you think I should proceed? I have backed my data so I won’t have any problems starting from scratch..However do you think it would fix things ?

Is downgrading to Mojave another option ?

9 de out de 2019 por Alican

Very interesting: When I enter 'diskutil cs list' at the terminal it says: 'No CoreStorage logical volume groups found'..

9 de out de 2019 por Alican

You could give Mojave a try, I haven't done anything with Catalina yet as I have apps which are 32bit which have not been upgraded yet by the developers. I have a showing in February and can't take the chance right now in any case.

Do you have a nearby Apple Store? Calling Apple will cost you ($$) as you are out of AppleCare support (unless you got the AppleCare+). In any case I would post a bug report so someone see's this failure.

Scratching the drives would be my last option here. Sorry not able to help more.

9 de out de 2019 por Dan

Thanks again Dan, I will try to find more about it before I scratch the drives

9 de out de 2019 por Alican

@alican43 - Let us know what you discover! Good Luck!

9 de out de 2019 por Dan

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MacSSD is listed twice! Is this a third party SSD like OWC or Transcend? — Dan
Thanks for the answer Dan

To answer your first comment: Nope, it is Apple proprietary Samsung SSUBX drive. I also do not understand why it is listed as twice…

To your second comment: I used to have 32Gb SSD + 1TB HD Fusion set-up..I splitted the fusion drive set-up then open the screen to swap 32GB for 512 GB SSUBX. I’d made 512 ssd my start-up disk and set the 1TB HD as an another hard-disk. I was using this setting without any problem; even started to use Boot Camp’ed Windows and everything was smooth until I upgraded to Catalina…

How do you think I should proceed? I have backed my data so I won’t have any problems starting from scratch..However do you think it would fix things ?

Is downgrading to Mojave another option ? — Alican
Very interesting: When I enter 'diskutil cs list' at the terminal it says: 'No CoreStorage logical volume groups found'.. — Alican
You could give Mojave a try, I haven't done anything with Catalina yet as I have apps which are 32bit which have not been upgraded yet by the developers. I have a showing in February and can't take the chance right now in any case.

Do you have a nearby Apple Store? Calling Apple will cost you ($$) as you are out of AppleCare support (unless you got the AppleCare+). In any case I would post a bug report so someone see's this failure.

Scratching the drives would be my last option here. Sorry not able to help more. — Dan
Thanks again Dan, I will try to find more about it before I scratch the drives — Alican

abadius @abadius Rep: 1 · Answer 1 · 2020-03-28T13:08:46-07:00

abadius @abadius

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Hi,

I found the same problem, after searching a lot I didn't find any solution. AppleCare says me I should use fusion drive again… I really don't like that solution…

I have tried to format my 2 drives using USB boot restore Catalina, but Catalina is not recognizing my drives as individual drivers, instead it still recognizes them as split fusion drive, what is the problem?

Maybe install Catalina on a external USB and use Boot Camp at Catalina HD will work?

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The solution I found was to go back to Mojave, I've been using Mojave since then without a problem. I have very limited knowledge in software and I think so does AppleCare.

So if you really want to use Catalina in a healthy way, I suggest you find someone who is experienced in Apple software.

29 de mar de 2020 por Alican

The problem is you first need to disengage Fusion services following this guide Split Your Fusion Drive Apart Apple never properly setup Fusion Drive management in any of their macOS's and to add to it you have two file systems HFS+ and APFS which makes this even more complex!

I also find I need to use an external bootable drive is the best way to nuke both drives fully and then rebuild them as well so no remnants are left hidden.

I also am careful in how I restore the users user accounts, apps & data using TimeMachine backup.

29 de mar de 2020 por Dan

Today, I tried a lot of things.

1- Use Carbon Carbon Copy Cloner to clonate Mojave MacbookAir on USB and boot Mojave on the iMac with Catalina: didn't work, you can't use bootcamp instaler with USB conected.

2- I tried to instal W10 without Bootcamp: I created the USB with the ISO file, created new partiton FAT32 using disk utility, everythings works fine... but when you are on the Windows installer and try to create a new partition, you can't do it. Tried to modify GPT / MBR to let Windows do the new NTFS partition, but doesn't work.

I decided I will use this issue to improve my iMac, I did Time Machine backup and bought a 2TB SSD to replace my old internal HDD, will use MacOS USB boot recovery to destroy all the partitions on this !&&*.

Now only can wait Amazon order to next steps

Thanks for sharing this solutions with me, I will continue writing the next steps

29 de mar de 2020 por abadius

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

Problems with Catalina; not recognizing my drives as 'dual' but fusion

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