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- Feb 10, 2012
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- Spennymoor UK
- Your Mac's Specs
- imac retina 5k 4ghz intel core i7
I have not upgraded to Catalina, but I have read that Catalina creates two partitions on the boot drive.
I have not upgraded to Catalina, but I have read that Catalina creates two partitions on the boot drive. One holds the system files and has a higher level of security. The other holds the user data and is labelled as such. What I think happened is that in trying to roll back, you did not reformat the drive, which left it with two partitions. You said one was labelled "data" and you renamed, which is how you ended up with two with the same name.
Assuming you don't care about what is on either of those drives, the best thing to do is to boot from a bootable external drive and run Disk Utility to reformat the drive entirely at the. highest level using APFS format. The reinstall whatever version you want to that empty drive and restore from your backup.
Let me see if I can parse out this to make sure I understand. If you click on the "View" box at the top of Disk Utility, there should be some options there. One is "Show only volumes" and the other is "Show all devices." I would bet that "Show only Volumes" is checked. Change to the other option and the fusion drive should show up with the two volumes indented below it. I give up on the rest of the sentence, I can't make heads or tails out of what you are trying to say, sorry. The reason the fusion drive is greyed out is that you cannot format the boot drive while booted from it. So you have to boot from recovery, or an external drive to get erase access to the internal fusion drive itself.i dont seem to have the option to go a level higher than the the 2 drives as you can see in the screenshot showing the drives in recovery mode in disk utility vs the screen shot showing the drives by just showing disk utility in the normal mac boot up and in that mode the option to erase the fusion drive is greyed out but this drive does not show in recovery mode only the 2 hdds
Let me see if I can parse out this to make sure I understand. If you click on the "View" box at the top of Disk Utility, there should be some options there. One is "Show only volumes" and the other is "Show all devices." I would bet that "Show only Volumes" is checked. Change to the other option and the fusion drive should show up with the two volumes indented below it. I give up on the rest of the sentence, I can't make heads or tails out of what you are trying to say, sorry. The reason the fusion drive is greyed out is that you cannot format the boot drive while booted from it. So you have to boot from recovery, or an external drive to get erase access to the internal fusion drive itself.