The following is the ORA-00206 error message, you can learn the cause and solution of the Oralce error.
ORA-00206 error in writing (block string, # blocks string) of controlfile
Cause: A disk I/O failure was detected on writing to the control file.
Solution: Check that the disk is online. If it is not, bring it online and shut down and restart Oracle. If it is online, then look for operating system reasons for Oracle’s inability to write to the disk or control file. See the Oracle9i Database Administrator’s Guide for information on recovering from the loss of a control file. See also your operating system-specific Oracle documentation.
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