The back up volume is read only?

Can anyone help me with this? When time machine tries to run a back-up I get two errors and it fails. The first says:
Time Machine Error
The back up volume is read only.
The second one says:
Disk Repair
The disk was not repairable by this computer. It is being made available to you with limited functionality. You must back up your data and reformat the disk as soon as possible.

AndyPrior wrote:
The back up volume is read only.
see C6 in [this_|http://web.me.com/pondini/TimeMachine/Troubleshooting.html] user guide.
JGG

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