20204   zERR WRITE FAILURE

Source:  NSS, Common Layer, General Storage System

Explanation:  An attempt to write to a low-level asynchronous block failed.

Possible Cause:  A failure occurred in the disk controller or other hardware component. If Read After Write Verify is turned on, the media might have a bad sector.

Action:  Try the write again.

If the error persists, do the following:

1. Reboot the server.

2. Try to back up the disk so you have the most current snapshot of the data.

3. Reformat the disk.

4. Restore the data from backup.