Fixing my fusion drive disk after factory reset

iMac.Help

macrumors newbie
Original poster
Jan 9, 2020
1
0
I recently factory reset my 2017 iMac with 1TB fusion drive. After the reset, it split my fusion drive and it took me a while to figure out how to combine the drives together through google searches and youtube. I have absolutely no tech background. I just followed a few youtube videos of factory resetting and fixing your split fusion after speaking to several Apple Support who couldn't figure out why I had only 27GB after resetting my computer.


Now my question is - Shouldn't disk 0 and disk 1 be combined together since it's "(internal, physical)"? Not sure if I'm supposed to see disk 2 and disk 3. Could someone help me with this and verify?


diskutil.png
 

naerct

macrumors member
Mar 19, 2019
93
14
Southern NH
I think you may have more difficult problems. I think Apple will dread the day they starting using Fusion drives. It appears that there are problems with Fusion drives and APFS which is required for booting as of Mojave. It also looks like you are already in Catalina by the main folder structure and definitely using APFS. I would Google Fusion drives with Catalina and see the problem. I actually uncoupled them for a friend with a 2015 iMac i7 with the 3TB Fusion. At least the 120GB SSD is big enough for a boot drive. You have a 28GB SSD and over 30GB of boot disk. But you are not even close as you need to account for the macS scratch disk which is essential for swapping out RAM as you change apps. I haven't had the time to read the entire thing as I haven't had that problem. Apple has to fix this, or you need to go back to High Sierra where the boot drive can be the old HFS+ file system. If there's a suit, you may end up getting a 256GB SSD. This is the same old problem of Apple making the consumer buy its products with half the technology and twice the price. Now they have advanced the technology for their new file system, but alienated almost everyone with a fusion drive. That's how I see it anyway.
 

Brian33

macrumors 6502a
Apr 30, 2008
810
64
USA (Virginia)
Now my question is - Shouldn't disk 0 and disk 1 be combined together since it's "(internal, physical)"? Not sure if I'm supposed to see disk 2 and disk 3.
Yes, disk0 and disk1 (more accurately, specific partitions of them) are combined to make the "synthesized" disk3. It looks right to me -- except I don't understand why disk3 is shown as 1.0 TB; I would have expected it to show 1.28 TB.

disk2, disk4, and disk5 are disk images so you can ignore them. (Note that the disk numbers can change after a reboot -- I would expect what's currently disk3 to show up as disk2 after a reboot with no disk images.)
 

gilby101

macrumors regular
Mar 17, 2010
235
93
Tasmania
except I don't understand why disk3 is shown as 1.0 TB; I would have expected it to show 1.28 TB.
I think you mean it should be 1.028 TB, which is rounded (or truncated?) to one decimal place as 1.0 TB.

I agree with your comments and it looks right to me as well.
 
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