Upgrade from 10.9.2 to 10.9.3 has stopped my Time Machine backups from working

in macOS edited May 2014

Hi. Just now I upgraded my Mac from 10.9.2 to 10.9.3.


I also use Time Machine to back up my Mac to an external drive and I've been using it for years.


One result of the update from 10.9.2 to 10.9.3 is that I'm now unable to back up to my Time Machine drive. I successfully backed up to it earlier this afternoon at 3:17PM (it's now 4:32PM), but I'm now getting this error message:



"Time Machine couldn't complete the backup to 'Time Machine Backup.'


Files can't be copied onto the backup disk because it is read-only. You may need to repair or erase the disk using Disk Utility. If the disk can't be repaired, select a different disk for backups.


Last successful backup: Today, 3:17PM"


I shut down my Mac and restarted it, thinking maybe the error would go away, but it hasn't.


Did 10.9.3 somehow make my Time Machine backup drive read-only? Is there a way to change it back so that it also has write permissions? I can't figure out how to do it. Or am I going to have to erase the drive?





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