Time Machine not working...it says the external drive is read only?

Richard Christensen
Richard Christensen used Ask the Experts™
on
I have been using a 4 TB external hard drive to do time machine backups.  time machine stopped working
about 6 months ago and it says that time machine is not working...the drive is read only.  I have previous time
machine backups on that drive.  What has caused this and what should I be doing about it?
Thanks,
capreol
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David FavorFractional CTO
Distinguished Expert 2018

Commented:
Could be a variety of reasons.

One simple action to take, which might help, is to run Disk Utility, choosing the repair permissions option.

This provides a good starting point. Might fix the problem or surface the reason for the problem.
Top Expert 2013
Commented:
look if the suggested fixes help you :  https://www.lifewire.com/fix-time-machine-errors-2259975
Richard ChristensenRetired computer technician

Author

Commented:
Thanks to the member's who provided answers to my question.  What the user of this PC was doing
was unplugging the external backup drive and then plugging it in later.  This activity provided considerable
confusion for the Time Machine software.  The drive should have been properly ejected electronically.
thanks,
capreol
Top Expert 2013

Commented:
tx for the update !

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