Cannot mount external disk :diskutility error

[droplink]

HI folks!

My old iMac died. (rest in piece) While contemplating buying a Mac Studio, I bought a used replacement.
I took out the drive of the old one, and want to access the files from it to put onto the "new" one.
I have a TimeMachine backup that I have used to restore the New mac with, but its not 100% current, so it would be nice to get the latest files back up as well. (Would you believe the old iMac died when I was starting a TimeMachine run..!)

Unfortunately, when put inside an enclosure and mounted externally, only my windows partition shows up.
DiskUtility cannot mount it, repair or give any indication of what is wrong.

What can I do?
As you can see below the disk has two partitions, one APFS and one Bootcamp. The bootcamp mounts fine.

DiskUtil list in terminal gives the following info:

/dev/disk4 (external, physical):


#: TYPE NAME SIZE IDENTIFIER


0: GUID_partition_scheme *1.0 TB disk4


1: EFI ⁨EFI⁩ 209.7 MB disk4s1


2: Apple_APFS ⁨⁩ 850.6 GB disk4s2


3: Microsoft Basic Data ⁨BOOTCAMP⁩ 149.2 GB disk4s3

 

[Fishrrman]

Just wondering...
Did the old iMac have a FUSION drive inside?
Or... just a platter-based HDD?

If it had a fusion drive, which is actually TWO drives combined "into one" by software, and you took out only the HDD, then... the "Mac" partition of the drive will not be readable (because you "broke" the "fusion").

The Windows partition (on a fusion drive Mac) is ALWAYS located 100% on the HDD, so it would be "untouched" and mountable.

 

[droplink]

Yes, its a fusion drive.
I was under the impression that Apple changed how the fusion drives worked, and that the SSD part is now only the cache of the hard drive?

EDIT: here is the comment:

SOLVED: Is there any way to recover data from an Apple Fusion drive? - iMac Intel 27" Retina 5k Display

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...

www.ifixit.com

See the post second from bottom

 

[Fishrrman]

OP:
"See the post second from bottom"

I went and read it.
It would seem to me that if that were the case with the HDD that YOU have, then you wouldn't be having the problem you're having.

I'd just go to the tm backup and use that instead.

 

[droplink]

Yes, that is why I asked...
If I did not have a problem, I would not have asked

I have used the TimeMachine backup, and I was able to recover all other data from other sources, so all good for me.