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  1. #16
    Quote Originally Posted by MacInWin View Post
    What I would recommend is a clean reinstall, then use Migration Assistant to pull in your data when it is first offered on the initial boot up from the clean install. Don't restore, let MA do the work for you. That way you should end up with your account and data looking exactly as it does now.

    To do a clean install, you can either use DiskmakerX to build a bootable thumb drive with Catalina on it, or you can use the Recovery process. About macOS Recovery - Apple Support
    I did the other method before I saw this. I deleted "Macintosh HD" and then renamed "2" to just "Macintosh HD" and rebooted. Now everything looks perfectly normal and Time Machine isn't giving me any errors. Thank you for the help!

    Screen Shot 2019-12-07 at 4.03.31 PM.png
    Last edited by ccarmical; 12-07-2019 at 05:04 PM. Reason: Add screen cap

  2. #17
    Weird disk issue after Time Machine restore
    MacInWin's Avatar
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    Glad that worked. It is a bit more risky, but if it worked, great!
    Jake

  3. #18
    I had a similar issue but a restore wasn't involved.

    My machine is running Catalina and time machine was backing up to two drives.

    All was going well until out of the blue time machine reported that the operation had failed and I got the message about two drives (but the message was only appearing for one of the back up drives). I reformatted the drive, but on the first backup got the message again.

    I've stopped using the drive and am now just backing up to one drive, but am wondering what's gone wrong?

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  4. #19
    Quote Originally Posted by tomg35 View Post
    I had a similar issue but a restore wasn't involved.

    My machine is running Catalina and time machine was backing up to two drives.

    All was going well until out of the blue time machine reported that the operation had failed and I got the message about two drives (but the message was only appearing for one of the back up drives). I reformatted the drive, but on the first backup got the message again.

    I've stopped using the drive and am now just backing up to one drive, but am wondering what's gone wrong?

    Sent from my Pixel 4 using Mac-Forums mobile app
    Silly question, but do the two drives have the same name?

  5. #20
    Quote Originally Posted by ccarmical View Post
    Silly question, but do the two drives have the same name?
    Not a silly question at all - no they don't

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  6. #21
    Well this two drives with the same name continues, now happening on my Mac mini and MacBook air.

    The thing I find strange is how randomly it happens.

    Time machine works fine for days on end then up pops the message. One 'fix' I did find is to reboot the machine. When I then run time machine it works fine but seems to be thinking that it's the very first backup and so takes a while.

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  7. #22
    Weird disk issue after Time Machine restore
    MacInWin's Avatar
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    @tomg35, You have sort of jumped into the middle of this conversation but not provided a lot of information about your setup. So, what Mac(s) are involved? What version of the OS on each/any of them? How do you have Time Machine set up to operate? Do each of the systems that are being backed up have an individual set of drives for the backups, or do they share drives. What does Disk Utility report on the backup drive(s) as far as Containers and Volumes? When you say "two drives with the same name" what, exactly, is showing two drives with the same name?

    We need a bit more detail to sort out what is happening in your system.
    Jake

  8. #23
    As I say I have a Mac mini and and a MacBook air.

    Both are on the latest version of Catalina and both back up time machine to individual drives specific for that use.

    In drive utility, on both machines, it shows machintosh and machintosh data (like the original poster).

    The message I get is identical to the original poster, it also suggests renaming one of the drives 'recovery'.

    I have looked at other forums about this issue and some mention that something went wrong when the user upgraded to Catalina. Given this 'something' has happened to both of my machines I wonder if this is by design?

    If something has gone wrong then why does time machine work other times,or as i have found a reboot allows you to continue. If have two partitions on a drive is incorrect then the backup would fall every time.



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  9. #24
    Weird disk issue after Time Machine restore
    MacInWin's Avatar
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    Catalina changed the way the system is organized. First off, the format of the boot drive (and the backups in Time Machine) were changed from HFS+ to APFS. In APFS, the concept of partitions has changed. Instead of having partitions to mount as drives, there is a Container, in which Volumes can be created to share the total space of the Container. In the simplest case, there would be one container on your boot drive, with the ability to have multiple Volumes in the Container, each mounted as individual drives. However, there is a special use case for the system itself. In Catalina, what was on the default Macintosh HD drive in previous versions was divided into a set of system files and a set of User files. The System files were put in one Volume named Macintosh HD (or whatever you named the boot drive) and the user files are now in a second volume called Macintosh HD - Data, or whatever you named the boot drive with the "- data" appended. The operating system combines the two drive when it boots so that to Finder, or on the desktop, there is one icon and in that icon are all the files for both Volumes. However, Disk Utility can see that there are two volumes, as can Time Machine. So when you make a backup with TM, if you open the backups.backupdb folder and look at the backup, you will see both names. However, if you open Time Machine normally, again the OS merges the two Volumes to look like one. So if you bypass TM, Finder, etc, and look at the Container directly, there will be two volumes (actually more than two but the others are hidden), but the "normal" view is the merged, single drive view in Finder. TM sees both Volumes because it has to be able to put back to each of those two volumes the files that were there originally. So TM sees both volumes. Disk Utility sees both volumes because it is the tool used to create and remove volumes, so it has to know about all the volumes in the container.

    Bottom line: Macintosh and Macintosh - Data are not duplicates, but separate volumes, both required, that are merged by the OS into Macintosh HD as it appears on the desktop and Finder.

    BTW, as a benefit of the Container/Volume approach of APFS, if you want to divide a drive into multiple drives, you no longer use partitioning to create fixed size drives, you simply add a volume to the container and it will share the free space in the container with all the other volumes there. Similarly, if you want to remove a volume, you can, without impacting the other volumes in the container.

    From your description, it's hard to tell exactly what you are seeing. It would help if you gave some screenshots of where you see these duplicated names. If they are what I just described, that's normal. If either Macintosh HD or Macintosh HD - Data are duplicated, that is not.
    Jake

  10. #25
    What I see in disk utility is the same as the original poster, except that I haven't renamed mine - mine just says Macintosh and Macintosh HD. Finder just shows the one partition.

    I appreciate your explanation, as to what Apple has done, but I still don't understand why TM is having an issue on occasion (unless of course Apple didn't update the code for TM to expect two partitions with similar names).



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  11. #26
    Weird disk issue after Time Machine restore
    MacInWin's Avatar
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    unless of course Apple didn't update the code for TM to expect two partitions with similar names
    All I can say to that is that TM works perfectly for me and I am running Catalina. And in backups.backupdb there are now two volumes showing, so it knows what to do. I don't disconnect the drive, but I do use TimeMachineEditor to make backups to that drive just twice a day instead of hourly. In between, TM is turned off. The only thing I see in common for you and the OP is that you are making backups to two different drives, swapping them and disconnecting them to do that. I wonder if that function is where the issue crops up? Can you post a screenshot of what Disk Utility is showing in the sidebar?
    Jake

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