Why two I appear to have two drives following the Catalina update?
I erased the disc and installed fresh yet this is what appears in disk utility.
Anyone?
Thanks
iMac 27" 5K, macOS 10.15
That's normal. The Mac HD - Data volume is where your files and apps are kept and you have access to them just like the older system volumes.
The Macintosh HD volume is where the system and system support files are kept and the user has no access to them. It's part of the new security that Catalina brings to the table.
What version of Catalina are you running? I have Version 10.15 (19A602) and only the -Data volume is shown in the Finder or in the Storage section of About this Mac but both are shown in Disk Utility.
You will need to erase your drive completely, following these instructions
Boot into Safe Mode (Use Safe Mode to isoloate issues with your Mac) with both drives connected and start a backup to see if both get backed up. Then reboot normally and test again.
NOTE: Safe Mode boot can take up to 10 minutes as it's doing some system cache cleaning, volume verifying and directory repairing.
Check your Disk Utility app. There might be a “Mac HD/Macintosh HD” disk drive that is unnecessary and only taking up a few KB/MB of storage. That’s what happened to me, there was a third unnecessary drive. Also the program you’re using to check your drives with the photo attached isn’t Disk Utility?
alwyzgr8tful wrote:
I'm having the same issue with my MacBook Pro 2017...
I'm not sure what issue you think you are having, but you Data drive is not mounted. Since it isn't mounted, you would not be able to see your data.
The storage display for Macintosh HD (the OS) indicates that your drive is completely full. With an SSD, that is extremely bad. It will take forever for it to reclaim any free space made by deleting files.
Why the data drive is not mounting is concerning. There may be something wrong with the drive (besides it being full).
If you select it and click the Mount button, does it mount or produce an error.
You should probably create an entirely new post for this issue as it will likely take away from this thread trying to resolve your issue.
Thanks for the reply, they both show up in finder, I have attached images, and they have the exact same folders.
I am very confused by this whole thing, it seems there is an issue with the installation and/or restoration of data from time machine.
The Finder shows it as one drive. Ignore the other's existence.
What did you try to restore from? Was it a pre-Catalina backup or a Catalina backup?
You can't restore a pre-Catalina OS drive to a Catalina file system. It will fail.
Sadly that is exactly what happened to my computer and then beyond that it split my fusion drive into two drives. On a very long call to Apple Support (and a chain of calls every time OS was updated in the last 6 months and created issues for me) the only resolution was to format my Drive go into to terminal to rejoin the two drives and start over.
Worse than anything is that the whole back up thing with time machine that has worked for me for 15 years now? the new update wiped the external drive clean. All of my back up files are gone, nothing is accessible. So, after another long call with Support they confirmed that the Time Machine back ups for the last three years are useless.
I couldn’t be more upset and I have no answers
I recommend you take your device to an Apple store, if you want to keep your data. Otherwise if you have Mojave are you able to erase your drives properly with the manuals from the Apple website and reinstall MacOS Mojave? If you want to try this way I hope this works.
So obviously the drive is separate with the system files, then the data files.
Whats the process for installing a new SSD now based on this new way of separating the files for Catalina?
I’m concerned that if I don’t do this properly, I’ll lose all my data.
Guy... I'm referring to people that are downgrading from Catalina to Mojave. If you read my above comments and the issues that I ran into, you would understand that Mac HD Data does not need to be there.. ONLY if you have CATALINA should it stay there, NOT Mojave...
Robert,
My path to recovery was long and frustrating but my computer works again. Through hours of frustration I finally called in to Apple and it was connected to a higher level tech agent who walked me through completely reformatted my hard drive. It turned out my hard drive had split into two partitions. So I had to go through a crazy process in terminal two format and then re-join the two drives into one…
I hope your path is easier.
Cheers
Could you please tell me what you mean by 'reinstall correctly"
Here are the instructions on how to erase a disk which has Catalina installed.
https://support.apple.com/en-us/HT208496
And do look at lkrupp's explanation of the new filing system (eloquently explained).
FWIW, I have not ever seen a warning like that (your screenshot), so I do not know what that is except to guess that it may also have to do with something the new APFS did not allow.
There is something wrong - there is no way Apple takes half of a 2 TB drive for the OS - that Mac HD portion is normally quite small - mine is less than 12 GB:
So, can you post more details and provide screenshots please.
The only real issue I have found is with TimeMachine. There seems to be a ghost HD-Data drive that I have to unmount (I’m not a seasoned Mac user so I hope that’s the correct term) for Time Machine to work. The more I’ve read the more issues I see Catalina has.
I'm having this issue as well and it wouldn't be a big deal but Time Machine stopped backing up since upgrading to Catalina 2 weeks ago. TM never produced an error and had I had a disk issue I would have lost 2 weeks of data. I unmounted the 2nd HD - Data drive in disk utility and TM appears to be working. This is a bug that needs to be dealt with. I'm also a long-time Apple/ Mac user. I've given other Mac users the advice to stick with Mojave and will continue to do so.
Thanks H.W. So it turns out that I actually was showing 2 Data drives. One was empty. So at the Apple store, we looked at it, and deleted the extra data drive that was empty and it all seems ok.
Macintosh HD and Macintosh HD Data?
