unable to install Catalina

Question

SA Chief Author

Level 1

5 points

unable to install Catalina

When select hd for install, "this disc used for Time Machine backup" and can't install

iMac 27", macOS 10.14

Posted on Oct 23, 2019 9:10 AM

Reply

Answer 1

Best reply

Eau Rouge

Level 8

42,560 points

Oct 23, 2019 9:16 AM in response to SA Chief

As it says if the disk you want to install Catalina on is being used for Time Machine backups then you cannot install

Catalina or any other macOS on it. Open System Preferences> Time Machine and see if your disk is being used

for Time Machine backups. Or use Finder to search for a folder called Backups.backupdb.

Reply

Answer 2

SA Chief Author

Level 1

5 points

Oct 23, 2019 9:40 AM in response to Eau Rouge

I've an external disc I named TM Backup; but both HD and TM backup say they are used for TM Backup. I disconnected the external disc and the HD still indicates its used for TM. Any other ideas allow installation of Catalina?

Reply

Answer 3

SA Chief Author

Level 1

5 points

Oct 23, 2019 2:30 PM in response to Eau Rouge

Yes, found old backup folders

Reply

Answer 4

Eau Rouge

Level 8

42,560 points

Oct 23, 2019 10:52 AM in response to SA Chief

Have you looked on your iMacs internal drive for the folder Backups.backupdb?

Reply

Answer 5

Oct 25, 2019 9:31 AM in response to SA Chief

I have the same issue - on installation, my iMac’s HD is greyed out with a message ’This disk is used for Time Machine backups’. It isn’t, and I don’t have the folder mentioned here on my HD.

Reply

unable to install Catalina

Similar questions