Time Machine can't use the disk image because it can't be written to.

Time Machine can't use the disk image because it can't be written to. help!

VictorSMiller wrote:
I just started getting the same message.  I'm using a Western Digital My Book 3TB disk.  Normally I have the backups done with the disk attached to Airport Extreme.
I hate to have to tell you this, but backing-up that way is unreliable and not supported by Apple.   See:  Using Time Machine with an Airport Extreme Air Disk.
Backup failed with error: The target disk image volume is read-only.
Most likely, you got this message before all this started:
What that doesn't explicity say is, the backups failed the verification.  When that happens, Time Machine marks the sparse bundle as damaged and won't back up to it anymore (even if Repair Disk can't find the problem).  See #C13 in Time Machine - Troubleshooting for details.

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