After installing Catalina a second time, it put a second Mac HD data partition. Then when trying to use Time Machine, it failed. Because there are two drives with the same name HD data. How do I rename the drive or delete the Drive. How do I know which one Catalina is using?
iMac Line (2012 and Later)
I had this after doing a recovery. Here's how I fixed it, WITHOUT going into recovery mode (although that is the proper way to do this):
Note that before I tried this, I just ejected the volume and emptied the trash thinking it would work like the old .dmg install mounts, but upon restarting lo and behold there it appeared.
Hope that helped give an easy way to end the suffering!
Chris.
Launch Disk Utility, take a screenshot of the sidebar and post. Like this:
The -Data drive/volume is your working volume with your applications, home folder with its sub folders, etc. The other drive/volume is a read-only drive for the system and its files. It's Apple's next step in securing the system from outside miscreants.
I've rename named my volumes. The data volume is Toad Hall and the other is Catalina:
Just ignore the non-data volume.
This illustrates my case.
From the reply by craig150 it seems it happened when I downloaded Catalina from the Mac App Store to create a backup bootable USB installation drive. It looks like the data volume being used is the one at the bottom, but no idea what to do to revert to normal, other than re-formatting the HD again.
Answering to myself (hope it helps):
Catalina is installed on a dedicated read-only system volume, while your files and data are stored separately in another volume labelled with the suffix "- Data."
The idea behind this setup is that it helps prevent the accidental overwriting of critical operating system files, since the user can no longer alter data or store files on the read-only system volume.
In practice, the average user shouldn't notice any difference after the split, since both volumes appear in Finder as a single unified volume.
Forcing us to live with apples so called security scheme of making 2 partitions on my drive is crap! Guess I won't be upgrading to Catalina any time soon. As soon as I saw my test drive was formatted this way I knew I wasn't going to like the direction they're going in. Too bad since I've been an Apple fan and Mac user since about 1986.
This has 3 drives. 2 are data drives. I suspect it added the 3rd one when I reinstalled. Still trying to figure out if I can delete it, without any consequences or rename it. I am not sure I want to rename something that I don’t need
Finally an answer ;
everything is back to normal
after talking to a senior analyst ; the drives must be erased before installing catalina; otherwise it will just keep install new ones with the old data drives.
I have 2 external HD. First one with High Sierra. The other one with Catalina.
When I boot on Catalina HD, I see only one volume for this HD.
When I boot on High Sierra HD, I see Catalina 2 volumes.
Is it normal ?
Should I do something ?
Thanks in advance for helping.
Time Capsule was an external drive made by Apple to hold your Time machine backup. It hasn't been around for quite some time. However, the instructions apply to any Time machine backup on any external drive that you have.
To remove the redundant “Macintosh HD data” before a fresh Catalina install:
In recovery mode disk utility there is the VOLUME + - in the top of the box. Select your “Macintosh HD data” and then click -
This will delete it.
The mac was about half full, however now it seems to have taken the majority of the space, may a double copy?
I have this question too...
Did you reinstall, Catalina a 2nd time? Do you have other volumes or containers on the same disk?
OS Catalina. 2 MAC HD data drives
