Time machine won't back up after Maverick install

Installed Maverick today on macbook pro, then have been unable to back up to Time Machine to my Western Digital 3TB drive.  Last back up was successful just before install earlier today. 
Time Machine Error "Files can’t be copied onto the backup disk because it appears to be read-only.
and a second message
Time Machine couldn’t complete the backup to “My Book”. Files can’t be copied onto the backup disk because it appears to be read-only. You may need to repair or reformat the disk using Disk Utility. If the disk can’t be repaired, you must use a different disk for backups. Open Time Machine preferences to select a different backup disk.
First restarting after Maverick install I received an error message that the disk "my book" could not be repaired.
When I go to get info on the external drive, under sharing and permissions it sayes I can read only, and I cant figure out how to change this everything to try is grey'd out.
Any help in fixing the problem and understanding the issue.

I'm also having this issue. I havn't had it before.
Any help would be appreciated.

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