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Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working

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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?

Thanks.

M

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Thread

Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Mirsky <not_my_email@invalid.email.com> - 2014-05-15 16:41 -0700
  Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Chris Schram <chrispam1@me.com> - 2014-05-15 16:46 -0700
    Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Paul Sture <nospam@sture.ch> - 2014-05-16 22:11 +0200
    Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Mirsky <not_my_email@invalid.email.com> - 2014-05-16 18:23 -0700
  Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working dempson@actrix.gen.nz (David Empson) - 2014-05-16 14:43 +1200
  Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working David Ritz <dritz@mindspring.com> - 2014-05-16 11:05 -0500
  Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-05-16 19:07 -0400
    Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Mirsky <not_my_email@invalid.email.com> - 2014-05-16 18:24 -0700
      Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Alan Browne <alan.browne@FreelunchVideotron.ca> - 2014-05-17 08:15 -0400
  Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-05-16 19:48 -0700
    Re: Update from 10.9.2 to 10.9.3 stopped my Time Machine backups from working Fred Moore <fmoore@gcfn.org> - 2014-05-19 11:13 -0400

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