What happens if you eject your macintosh hd

When you upgraded to macOS Catalina, the installer purposely created these two "drives. This was done primarily for security reasons. It is my understanding if you downgrade from Catalina using a Time Machine backup, these would be "corrected" to a single Macintosh HD as you had before. At this point, I would not recommend that you try deleting the - Data drive. Please double-check the steps Apple has provided in the following support article to see if there was anything that you missed when you downgraded.

Nov 20, AM. Communities Get Support. Sign in Sign in Sign in corporate. The Mac power supply must remain connected and the computer lid must remain open. Note : Your drive may still eject if you manually put your Mac to sleep even after changing these settings. Hard Drives. Solid State Drives. Mobile Drive. Professional SSD. Software Downloads. Test the external drive using a different cable Test a different power supply external desktop drive Connect to a different USB or Thunderbolt port on your computer Diagnose your external drive by running First Aid.

No idea but at minimum there will always be two. The system drive is now read only and appears logical separate from your data. Looks like when I eject the seven "ejectables" so I'm left with one on the desktop and go in Disk Utility those seven are listed as unmounted greyed out and there are two left mounted Macintosh HD and Macintosh HD - Data. They are the two that have signficant "in use" numbers within Disk Utility.

I'm tempted to delete the other volumes that show no data when opened in Finder and show minimal in use numbers in Disk Utility all less than 1 MB.

Thought I'd show what disk itility looks like after ejecting all but the "good" icon:. And here's what Info of that disk looks like -- note that the Used and Available don't add up correctly to 2 TB:. Search by keywords or tags Submit Search Clear search query Additional information about Search by keywords or tags Supported Searches:.

Click again to start watching. Please help -- if anyone has any suggestions, I'd really appreciate it! Beta macOS. Asked by ssandhaus.